The title compound, C13H18N2O2, is an N4-isopropyl-L-phenylalanine-based oxadiazinanone. Although the two molecules in the asymmetric unit are oriented appropriately for hydrogen bonding, the distance between the donor and acceptor atoms is large enough to support only weak, if any, hydrogen bonding. The absolute configuration is known based on the known starting compounds in the synthetic procedure.
Supporting information
CCDC reference: 690937
Key indicators
- Single-crystal X-ray study
- T = 100 K
- Mean (C-C) = 0.005 Å
- R factor = 0.060
- wR factor = 0.134
- Data-to-parameter ratio = 11.4
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT340_ALERT_3_C Low Bond Precision on C-C Bonds (x 1000) Ang ... 5
| Author Response: The few low precision bonds above the test threshold are only barely
so. The refinement seems to be the best possible for the dataset. Having two
independent molecules in the unit cell provides access to better average bond
precision for those in question.
|
PLAT066_ALERT_1_C Predicted and Reported Transmissions Identical . ?
| Author Response: SADABS calculated a "Ratio of minimum to maximum apparent
transmission: 0.859376". This seems anomalously low for a
C,H,N,O structure, but commonly occurs when using SADABS. The
values calculated by SHELXL seem to be equally meaningful, so
they were reported unchanged.
|
PLAT720_ALERT_4_C Number of Unusual/Non-Standard Labels .......... 8
| Author Response: Our labeling scheme was analogous to past related structures.
|
PLAT790_ALERT_4_C Centre of Gravity not Within Unit Cell: Resd. # 2
C13 H18 N2 O2
| Author Response: Choice of residue location is better for H-bond viewing when looking
at asymmetric unit alone.
|
Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
correct. If it is not, please give the correct count in the
_publ_section_exptl_refinement section of the submitted CIF.
From the CIF: _diffrn_reflns_theta_max 28.28
From the CIF: _reflns_number_total 3499
Count of symmetry unique reflns 3498
Completeness (_total/calc) 100.03%
TEST3: Check Friedels for noncentro structure
Estimate of Friedel pairs measured 1
Fraction of Friedel pairs measured 0.000
Are heavy atom types Z>Si present no
| Author Response: MERG 4 gives 3499 unique reflections; MERG 2 gives 6209 unique
reflections, so there are 2710 Friedel pairs that were measured; however,
final refinement was carried out using MERG 4.
|
PLAT791_ALERT_4_G Confirm the Absolute Configuration of C5A ... S
| Author Response: We have
checked them carefully and they are correctly assigned.
|
PLAT791_ALERT_4_G Confirm the Absolute Configuration of C5B ... S
| Author Response: We have
checked them carefully and they are correctly assigned.
|
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
4 ALERT level C = Check and explain
3 ALERT level G = General alerts; check
1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
0 ALERT type 2 Indicator that the structure model may be wrong or deficient
1 ALERT type 3 Indicator that the structure quality may be low
5 ALERT type 4 Improvement, methodology, query or suggestion
0 ALERT type 5 Informative message, check
The title compound was prepared as previously reported (Dore et al.
(2006)).
All non-H atoms were refined anisotropically without disorder. All H atoms were
initially identified through difference Fourier syntheses then removed and
included in the refinement in the riding-model approximation (C–H = 0.95,
0.98, 0.99 and 1.00 Å for Ar–H, CH3 and CH2 and CH; N–H = 0.88 Å;
Uiso(H) = 1.2Ueq(C) except for methyl groups, where Uiso(H)
= 1.5Ueq(C)). In the absence of significant anomalous scattering effects,
Friedel pairs were merged.
Data collection: SMART (Bruker, 2003); cell refinement: SAINT-Plus (Bruker, 2003); data reduction: SAINT-Plus (Bruker, 2003); program(s) used to solve structure: SIR2004 (Burla et al., 2005); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and Mercury (Macrae
et al., 2006); software used to prepare material for publication: WinGX (Farrugia, 1999) and publCIF (Westrip, 2008).
(4
R,5
S)-5-Benzyl-4-isopropyl-1,3,4-oxadiazinan-2-one
top
Crystal data top
C13H18N2O2 | F(000) = 1008 |
Mr = 234.29 | Dx = 1.242 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 8817 reflections |
a = 9.6423 (14) Å | θ = 2.3–30.5° |
b = 11.4974 (17) Å | µ = 0.09 mm−1 |
c = 22.600 (3) Å | T = 100 K |
V = 2505.5 (6) Å3 | Block, colourless |
Z = 8 | 0.43 × 0.23 × 0.23 mm |
Data collection top
Bruker SMART APEX CCD diffractometer | 3499 independent reflections |
Radiation source: sealed tube | 3403 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.041 |
ω scans | θmax = 28.3°, θmin = 1.8° |
Absorption correction: multi-scan SADABS in SAINT-Plus (Bruker, 2003) | h = −12→12 |
Tmin = 0.965, Tmax = 0.981 | k = −15→15 |
25602 measured reflections | l = −29→30 |
Refinement top
Refinement on F2 | 0 restraints |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.060 | w = 1/[σ2(Fo2) + (0.0413P)2 + 1.6549P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.133 | (Δ/σ)max < 0.001 |
S = 1.32 | Δρmax = 0.37 e Å−3 |
3499 reflections | Δρmin = −0.25 e Å−3 |
307 parameters | |
Crystal data top
C13H18N2O2 | V = 2505.5 (6) Å3 |
Mr = 234.29 | Z = 8 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 9.6423 (14) Å | µ = 0.09 mm−1 |
b = 11.4974 (17) Å | T = 100 K |
c = 22.600 (3) Å | 0.43 × 0.23 × 0.23 mm |
Data collection top
Bruker SMART APEX CCD diffractometer | 3499 independent reflections |
Absorption correction: multi-scan SADABS in SAINT-Plus (Bruker, 2003) | 3403 reflections with I > 2σ(I) |
Tmin = 0.965, Tmax = 0.981 | Rint = 0.041 |
25602 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.060 | 0 restraints |
wR(F2) = 0.133 | H-atom parameters constrained |
S = 1.32 | Δρmax = 0.37 e Å−3 |
3499 reflections | Δρmin = −0.25 e Å−3 |
307 parameters | |
Special details top
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes)
are estimated using the full covariance matrix. The cell e.s.d.'s are taken
into account individually in the estimation of e.s.d.'s in distances, angles
and torsion angles; correlations between e.s.d.'s in cell parameters are only
used when they are defined by crystal symmetry. An approximate (isotropic)
treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s.
planes. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
O1A | 0.5275 (2) | 0.74524 (18) | 0.71574 (9) | 0.0200 (4) | |
C2A | 0.5986 (3) | 0.7897 (3) | 0.76134 (13) | 0.0176 (6) | |
O17A | 0.6692 (2) | 0.87684 (18) | 0.75304 (9) | 0.0213 (4) | |
N3A | 0.5897 (2) | 0.7389 (2) | 0.81457 (10) | 0.0170 (5) | |
H3A | 0.6512 | 0.7603 | 0.8412 | 0.02* | |
N4A | 0.4904 (2) | 0.6534 (2) | 0.83257 (10) | 0.0154 (5) | |
C5A | 0.3806 (3) | 0.6483 (2) | 0.78779 (12) | 0.0165 (5) | |
H5A | 0.3265 | 0.5752 | 0.7943 | 0.02* | |
C6A | 0.4435 (3) | 0.6429 (3) | 0.72638 (13) | 0.0191 (6) | |
H6A1 | 0.5015 | 0.5723 | 0.7227 | 0.023* | |
H6A2 | 0.3687 | 0.6385 | 0.6964 | 0.023* | |
C7A | 0.2806 (3) | 0.7517 (3) | 0.79456 (13) | 0.0206 (6) | |
H7A1 | 0.3317 | 0.8247 | 0.7865 | 0.025* | |
H7A2 | 0.2059 | 0.7447 | 0.7647 | 0.025* | |
C8A | 0.2163 (3) | 0.7588 (3) | 0.85530 (13) | 0.0189 (6) | |
C9A | 0.0827 (3) | 0.7173 (3) | 0.86541 (14) | 0.0232 (6) | |
H9A | 0.031 | 0.686 | 0.8333 | 0.028* | |
C10A | 0.0233 (3) | 0.7206 (3) | 0.92131 (15) | 0.0263 (7) | |
H10A | −0.0681 | 0.6921 | 0.9273 | 0.032* | |
C11A | 0.0976 (3) | 0.7656 (3) | 0.96826 (14) | 0.0251 (7) | |
H11A | 0.0584 | 0.7669 | 1.0068 | 0.03* | |
C12A | 0.2293 (3) | 0.8086 (3) | 0.95870 (15) | 0.0281 (7) | |
H12A | 0.2802 | 0.8407 | 0.9908 | 0.034* | |
C13A | 0.2878 (3) | 0.8053 (3) | 0.90287 (15) | 0.0249 (7) | |
H13A | 0.3786 | 0.8354 | 0.8971 | 0.03* | |
C14A | 0.5541 (3) | 0.5392 (2) | 0.84671 (13) | 0.0180 (6) | |
H14A | 0.5723 | 0.4953 | 0.8093 | 0.022* | |
C15A | 0.6894 (3) | 0.5566 (3) | 0.88013 (14) | 0.0250 (7) | |
H15A | 0.7547 | 0.5999 | 0.8552 | 0.037* | |
H15B | 0.7291 | 0.4808 | 0.8902 | 0.037* | |
H15C | 0.6714 | 0.6006 | 0.9165 | 0.037* | |
C16A | 0.4514 (4) | 0.4714 (3) | 0.88512 (15) | 0.0285 (7) | |
H16A | 0.3644 | 0.4606 | 0.8633 | 0.043* | |
H16B | 0.4331 | 0.5149 | 0.9216 | 0.043* | |
H16C | 0.4908 | 0.3952 | 0.895 | 0.043* | |
O1B | 0.8672 (2) | 0.98233 (18) | 0.94720 (9) | 0.0218 (5) | |
C2B | 0.7980 (3) | 0.9425 (2) | 0.89999 (13) | 0.0175 (5) | |
O17B | 0.7047 (2) | 0.87193 (19) | 0.90751 (9) | 0.0221 (5) | |
N3B | 0.8282 (3) | 0.9856 (2) | 0.84613 (11) | 0.0187 (5) | |
H3B | 0.7824 | 0.955 | 0.8163 | 0.022* | |
N4B | 0.9257 (3) | 1.0754 (2) | 0.83144 (11) | 0.0177 (5) | |
C5B | 0.9584 (3) | 1.1386 (2) | 0.88641 (13) | 0.0188 (6) | |
H5B | 1.0451 | 1.1841 | 0.8792 | 0.023* | |
C6B | 0.9879 (3) | 1.0537 (2) | 0.93632 (14) | 0.0200 (6) | |
H6B1 | 1.0676 | 1.0036 | 0.9256 | 0.024* | |
H6B2 | 1.0123 | 1.0971 | 0.9727 | 0.024* | |
C7B | 0.8430 (3) | 1.2258 (3) | 0.90152 (14) | 0.0216 (6) | |
H7B1 | 0.8272 | 1.2779 | 0.8673 | 0.026* | |
H7B2 | 0.7558 | 1.1832 | 0.9094 | 0.026* | |
C8B | 0.8812 (3) | 1.2979 (2) | 0.95530 (14) | 0.0205 (6) | |
C9B | 0.9766 (4) | 1.3882 (3) | 0.95059 (15) | 0.0261 (7) | |
H9B | 1.0129 | 1.4084 | 0.9129 | 0.031* | |
C10B | 1.0197 (4) | 1.4496 (3) | 1.00054 (16) | 0.0291 (7) | |
H10B | 1.0845 | 1.5114 | 0.9968 | 0.035* | |
C11B | 0.9680 (4) | 1.4202 (3) | 1.05520 (17) | 0.0325 (8) | |
H11B | 0.9978 | 1.4613 | 1.0894 | 0.039* | |
C12B | 0.8727 (4) | 1.3309 (3) | 1.06053 (16) | 0.0341 (8) | |
H12B | 0.8368 | 1.3108 | 1.0983 | 0.041* | |
C13B | 0.8296 (4) | 1.2707 (3) | 1.01068 (15) | 0.0286 (7) | |
H13B | 0.7636 | 1.2099 | 1.0146 | 0.034* | |
C14B | 1.0493 (3) | 1.0225 (3) | 0.80199 (13) | 0.0207 (6) | |
H14B | 1.0973 | 0.9692 | 0.8303 | 0.025* | |
C15B | 1.0028 (4) | 0.9540 (3) | 0.74778 (15) | 0.0255 (6) | |
H15D | 0.9394 | 0.8919 | 0.76 | 0.038* | |
H15E | 1.084 | 0.9198 | 0.7283 | 0.038* | |
H15F | 0.9553 | 1.0062 | 0.7201 | 0.038* | |
C16B | 1.1483 (4) | 1.1180 (3) | 0.78295 (15) | 0.0320 (8) | |
H16D | 1.1788 | 1.1619 | 0.8178 | 0.048* | |
H16E | 1.101 | 1.1705 | 0.7554 | 0.048* | |
H16F | 1.229 | 1.0833 | 0.7634 | 0.048* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1A | 0.0219 (10) | 0.0205 (10) | 0.0176 (9) | −0.0022 (9) | −0.0014 (8) | 0.0017 (8) |
C2A | 0.0151 (12) | 0.0162 (13) | 0.0215 (14) | 0.0042 (11) | −0.0003 (11) | −0.0015 (11) |
O17A | 0.0237 (10) | 0.0186 (10) | 0.0217 (10) | −0.0034 (9) | −0.0026 (9) | 0.0017 (9) |
N3A | 0.0147 (11) | 0.0186 (11) | 0.0178 (11) | −0.0011 (10) | −0.0048 (9) | −0.0007 (9) |
N4A | 0.0146 (11) | 0.0122 (10) | 0.0193 (11) | 0.0005 (9) | −0.0011 (9) | 0.0018 (9) |
C5A | 0.0141 (12) | 0.0171 (12) | 0.0182 (13) | −0.0037 (11) | −0.0020 (10) | 0.0000 (11) |
C6A | 0.0199 (14) | 0.0189 (13) | 0.0185 (14) | −0.0034 (12) | −0.0037 (11) | −0.0001 (11) |
C7A | 0.0178 (13) | 0.0234 (15) | 0.0207 (14) | 0.0031 (12) | −0.0033 (11) | 0.0025 (12) |
C8A | 0.0175 (13) | 0.0149 (13) | 0.0243 (14) | 0.0059 (11) | −0.0035 (11) | 0.0008 (11) |
C9A | 0.0196 (14) | 0.0234 (14) | 0.0267 (15) | −0.0036 (13) | −0.0054 (12) | −0.0021 (13) |
C10A | 0.0217 (15) | 0.0255 (15) | 0.0317 (16) | −0.0036 (13) | 0.0020 (13) | 0.0049 (13) |
C11A | 0.0286 (16) | 0.0246 (15) | 0.0221 (14) | 0.0080 (14) | 0.0000 (13) | 0.0029 (12) |
C12A | 0.0248 (15) | 0.0331 (18) | 0.0265 (16) | 0.0082 (14) | −0.0089 (13) | −0.0110 (14) |
C13A | 0.0147 (13) | 0.0271 (16) | 0.0329 (17) | 0.0028 (12) | −0.0013 (12) | −0.0063 (13) |
C14A | 0.0232 (14) | 0.0139 (12) | 0.0169 (13) | 0.0039 (11) | −0.0021 (11) | 0.0013 (10) |
C15A | 0.0276 (16) | 0.0234 (15) | 0.0239 (15) | 0.0076 (13) | −0.0055 (13) | 0.0013 (12) |
C16A | 0.0364 (18) | 0.0229 (15) | 0.0262 (15) | −0.0040 (14) | −0.0032 (14) | 0.0086 (13) |
O1B | 0.0249 (11) | 0.0187 (10) | 0.0218 (10) | −0.0014 (9) | −0.0009 (9) | 0.0005 (9) |
C2B | 0.0183 (13) | 0.0134 (12) | 0.0207 (13) | 0.0045 (11) | 0.0003 (11) | −0.0028 (11) |
O17B | 0.0254 (11) | 0.0210 (10) | 0.0197 (10) | −0.0059 (9) | 0.0037 (9) | −0.0019 (8) |
N3B | 0.0194 (12) | 0.0183 (12) | 0.0185 (11) | −0.0044 (10) | −0.0018 (10) | 0.0001 (9) |
N4B | 0.0174 (11) | 0.0136 (10) | 0.0222 (12) | −0.0026 (9) | −0.0005 (9) | 0.0021 (9) |
C5B | 0.0183 (13) | 0.0146 (12) | 0.0233 (14) | −0.0044 (11) | −0.0033 (11) | 0.0017 (11) |
C6B | 0.0190 (13) | 0.0160 (12) | 0.0249 (15) | 0.0004 (11) | −0.0045 (12) | 0.0010 (11) |
C7B | 0.0202 (13) | 0.0159 (13) | 0.0286 (15) | 0.0020 (11) | −0.0040 (12) | −0.0003 (12) |
C8B | 0.0190 (13) | 0.0141 (13) | 0.0284 (15) | 0.0063 (11) | −0.0065 (12) | −0.0013 (11) |
C9B | 0.0283 (16) | 0.0179 (14) | 0.0319 (17) | 0.0011 (13) | −0.0076 (14) | 0.0023 (13) |
C10B | 0.0257 (16) | 0.0160 (14) | 0.046 (2) | 0.0012 (13) | −0.0127 (15) | −0.0024 (14) |
C11B | 0.0362 (19) | 0.0232 (15) | 0.0382 (19) | 0.0108 (15) | −0.0117 (16) | −0.0114 (14) |
C12B | 0.0343 (18) | 0.0376 (19) | 0.0305 (17) | 0.0087 (16) | 0.0041 (15) | −0.0045 (15) |
C13B | 0.0257 (15) | 0.0237 (17) | 0.0365 (18) | 0.0026 (14) | 0.0035 (14) | −0.0045 (14) |
C14B | 0.0161 (13) | 0.0246 (14) | 0.0215 (14) | 0.0050 (12) | 0.0007 (11) | 0.0062 (12) |
C15B | 0.0250 (14) | 0.0223 (14) | 0.0291 (15) | −0.0023 (13) | 0.0086 (12) | −0.0022 (13) |
C16B | 0.0276 (16) | 0.045 (2) | 0.0236 (16) | −0.0147 (16) | 0.0054 (13) | −0.0039 (15) |
Geometric parameters (Å, º) top
O1A—C2A | 1.339 (3) | O1B—C2B | 1.339 (3) |
O1A—C6A | 1.449 (3) | O1B—C6B | 1.444 (4) |
C2A—O17A | 1.226 (4) | C2B—O17B | 1.223 (4) |
C2A—N3A | 1.340 (4) | C2B—N3B | 1.346 (4) |
N3A—N4A | 1.431 (3) | N3B—N4B | 1.435 (3) |
N3A—H3A | 0.88 | N3B—H3B | 0.88 |
N4A—C5A | 1.466 (3) | N4B—C5B | 1.474 (4) |
N4A—C14A | 1.484 (3) | N4B—C14B | 1.494 (4) |
C5A—C6A | 1.516 (4) | C5B—C6B | 1.519 (4) |
C5A—C7A | 1.538 (4) | C5B—C7B | 1.536 (4) |
C5A—H5A | 1 | C5B—H5B | 1 |
C6A—H6A1 | 0.99 | C6B—H6B1 | 0.99 |
C6A—H6A2 | 0.99 | C6B—H6B2 | 0.99 |
C7A—C8A | 1.508 (4) | C7B—C8B | 1.517 (4) |
C7A—H7A1 | 0.99 | C7B—H7B1 | 0.99 |
C7A—H7A2 | 0.99 | C7B—H7B2 | 0.99 |
C8A—C13A | 1.385 (4) | C8B—C13B | 1.383 (5) |
C8A—C9A | 1.393 (4) | C8B—C9B | 1.391 (4) |
C9A—C10A | 1.388 (4) | C9B—C10B | 1.394 (5) |
C9A—H9A | 0.95 | C9B—H9B | 0.95 |
C10A—C11A | 1.381 (5) | C10B—C11B | 1.374 (5) |
C10A—H10A | 0.95 | C10B—H10B | 0.95 |
C11A—C12A | 1.380 (5) | C11B—C12B | 1.383 (5) |
C11A—H11A | 0.95 | C11B—H11B | 0.95 |
C12A—C13A | 1.383 (5) | C12B—C13B | 1.386 (5) |
C12A—H12A | 0.95 | C12B—H12B | 0.95 |
C13A—H13A | 0.95 | C13B—H13B | 0.95 |
C14A—C15A | 1.521 (4) | C14B—C16B | 1.517 (4) |
C14A—C16A | 1.530 (4) | C14B—C15B | 1.524 (5) |
C14A—H14A | 1 | C14B—H14B | 1 |
C15A—H15A | 0.98 | C15B—H15D | 0.98 |
C15A—H15B | 0.98 | C15B—H15E | 0.98 |
C15A—H15C | 0.98 | C15B—H15F | 0.98 |
C16A—H16A | 0.98 | C16B—H16D | 0.98 |
C16A—H16B | 0.98 | C16B—H16E | 0.98 |
C16A—H16C | 0.98 | C16B—H16F | 0.98 |
| | | |
C2A—O1A—C6A | 117.9 (2) | C2B—O1B—C6B | 117.4 (2) |
O17A—C2A—O1A | 118.6 (3) | O17B—C2B—O1B | 118.9 (3) |
O17A—C2A—N3A | 121.9 (3) | O17B—C2B—N3B | 121.9 (3) |
O1A—C2A—N3A | 119.5 (3) | O1B—C2B—N3B | 119.1 (3) |
C2A—N3A—N4A | 126.7 (2) | C2B—N3B—N4B | 128.0 (2) |
C2A—N3A—H3A | 116.7 | C2B—N3B—H3B | 116 |
N4A—N3A—H3A | 116.7 | N4B—N3B—H3B | 116 |
N3A—N4A—C5A | 108.3 (2) | N3B—N4B—C5B | 107.4 (2) |
N3A—N4A—C14A | 113.1 (2) | N3B—N4B—C14B | 109.5 (2) |
C5A—N4A—C14A | 114.3 (2) | C5B—N4B—C14B | 114.0 (2) |
N4A—C5A—C6A | 110.2 (2) | N4B—C5B—C6B | 110.4 (2) |
N4A—C5A—C7A | 110.7 (2) | N4B—C5B—C7B | 110.8 (2) |
C6A—C5A—C7A | 111.9 (2) | C6B—C5B—C7B | 113.0 (3) |
N4A—C5A—H5A | 108 | N4B—C5B—H5B | 107.5 |
C6A—C5A—H5A | 108 | C6B—C5B—H5B | 107.5 |
C7A—C5A—H5A | 108 | C7B—C5B—H5B | 107.5 |
O1A—C6A—C5A | 110.1 (2) | O1B—C6B—C5B | 109.9 (2) |
O1A—C6A—H6A1 | 109.6 | O1B—C6B—H6B1 | 109.7 |
C5A—C6A—H6A1 | 109.6 | C5B—C6B—H6B1 | 109.7 |
O1A—C6A—H6A2 | 109.6 | O1B—C6B—H6B2 | 109.7 |
C5A—C6A—H6A2 | 109.6 | C5B—C6B—H6B2 | 109.7 |
H6A1—C6A—H6A2 | 108.2 | H6B1—C6B—H6B2 | 108.2 |
C8A—C7A—C5A | 112.9 (2) | C8B—C7B—C5B | 111.1 (2) |
C8A—C7A—H7A1 | 109 | C8B—C7B—H7B1 | 109.4 |
C5A—C7A—H7A1 | 109 | C5B—C7B—H7B1 | 109.4 |
C8A—C7A—H7A2 | 109 | C8B—C7B—H7B2 | 109.4 |
C5A—C7A—H7A2 | 109 | C5B—C7B—H7B2 | 109.4 |
H7A1—C7A—H7A2 | 107.8 | H7B1—C7B—H7B2 | 108 |
C13A—C8A—C9A | 117.8 (3) | C13B—C8B—C9B | 118.4 (3) |
C13A—C8A—C7A | 121.5 (3) | C13B—C8B—C7B | 120.9 (3) |
C9A—C8A—C7A | 120.7 (3) | C9B—C8B—C7B | 120.5 (3) |
C10A—C9A—C8A | 121.4 (3) | C8B—C9B—C10B | 120.8 (3) |
C10A—C9A—H9A | 119.3 | C8B—C9B—H9B | 119.6 |
C8A—C9A—H9A | 119.3 | C10B—C9B—H9B | 119.6 |
C11A—C10A—C9A | 119.7 (3) | C11B—C10B—C9B | 119.7 (3) |
C11A—C10A—H10A | 120.1 | C11B—C10B—H10B | 120.2 |
C9A—C10A—H10A | 120.1 | C9B—C10B—H10B | 120.2 |
C12A—C11A—C10A | 119.4 (3) | C10B—C11B—C12B | 120.1 (3) |
C12A—C11A—H11A | 120.3 | C10B—C11B—H11B | 119.9 |
C10A—C11A—H11A | 120.3 | C12B—C11B—H11B | 119.9 |
C11A—C12A—C13A | 120.6 (3) | C11B—C12B—C13B | 119.9 (3) |
C11A—C12A—H12A | 119.7 | C11B—C12B—H12B | 120 |
C13A—C12A—H12A | 119.7 | C13B—C12B—H12B | 120 |
C12A—C13A—C8A | 121.0 (3) | C8B—C13B—C12B | 121.0 (3) |
C12A—C13A—H13A | 119.5 | C8B—C13B—H13B | 119.5 |
C8A—C13A—H13A | 119.5 | C12B—C13B—H13B | 119.5 |
N4A—C14A—C15A | 110.2 (2) | N4B—C14B—C16B | 109.5 (3) |
N4A—C14A—C16A | 107.8 (2) | N4B—C14B—C15B | 109.5 (2) |
C15A—C14A—C16A | 109.9 (2) | C16B—C14B—C15B | 109.3 (3) |
N4A—C14A—H14A | 109.7 | N4B—C14B—H14B | 109.5 |
C15A—C14A—H14A | 109.7 | C16B—C14B—H14B | 109.5 |
C16A—C14A—H14A | 109.7 | C15B—C14B—H14B | 109.5 |
C14A—C15A—H15A | 109.5 | C14B—C15B—H15D | 109.5 |
C14A—C15A—H15B | 109.5 | C14B—C15B—H15E | 109.5 |
H15A—C15A—H15B | 109.5 | H15D—C15B—H15E | 109.5 |
C14A—C15A—H15C | 109.5 | C14B—C15B—H15F | 109.5 |
H15A—C15A—H15C | 109.5 | H15D—C15B—H15F | 109.5 |
H15B—C15A—H15C | 109.5 | H15E—C15B—H15F | 109.5 |
C14A—C16A—H16A | 109.5 | C14B—C16B—H16D | 109.5 |
C14A—C16A—H16B | 109.5 | C14B—C16B—H16E | 109.5 |
H16A—C16A—H16B | 109.5 | H16D—C16B—H16E | 109.5 |
C14A—C16A—H16C | 109.5 | C14B—C16B—H16F | 109.5 |
H16A—C16A—H16C | 109.5 | H16D—C16B—H16F | 109.5 |
H16B—C16A—H16C | 109.5 | H16E—C16B—H16F | 109.5 |
| | | |
C6A—O1A—C2A—O17A | −179.4 (2) | C6B—O1B—C2B—O17B | 172.3 (2) |
C6A—O1A—C2A—N3A | −0.1 (4) | C6B—O1B—C2B—N3B | −11.2 (4) |
O17A—C2A—N3A—N4A | 166.0 (3) | O17B—C2B—N3B—N4B | 174.2 (3) |
O1A—C2A—N3A—N4A | −13.3 (4) | O1B—C2B—N3B—N4B | −2.2 (4) |
C2A—N3A—N4A—C5A | −12.3 (4) | C2B—N3B—N4B—C5B | −17.0 (4) |
C2A—N3A—N4A—C14A | 115.5 (3) | C2B—N3B—N4B—C14B | 107.2 (3) |
N3A—N4A—C5A—C6A | 47.0 (3) | N3B—N4B—C5B—C6B | 46.5 (3) |
C14A—N4A—C5A—C6A | −80.2 (3) | C14B—N4B—C5B—C6B | −75.0 (3) |
N3A—N4A—C5A—C7A | −77.3 (3) | N3B—N4B—C5B—C7B | −79.5 (3) |
C14A—N4A—C5A—C7A | 155.5 (2) | C14B—N4B—C5B—C7B | 159.1 (2) |
C2A—O1A—C6A—C5A | 35.5 (3) | C2B—O1B—C6B—C5B | 41.9 (3) |
N4A—C5A—C6A—O1A | −60.1 (3) | N4B—C5B—C6B—O1B | −61.0 (3) |
C7A—C5A—C6A—O1A | 63.5 (3) | C7B—C5B—C6B—O1B | 63.7 (3) |
N4A—C5A—C7A—C8A | −56.9 (3) | N4B—C5B—C7B—C8B | −175.5 (2) |
C6A—C5A—C7A—C8A | 179.9 (2) | C6B—C5B—C7B—C8B | 60.0 (3) |
C5A—C7A—C8A—C13A | 79.7 (4) | C5B—C7B—C8B—C13B | −99.3 (3) |
C5A—C7A—C8A—C9A | −99.6 (3) | C5B—C7B—C8B—C9B | 76.3 (3) |
C13A—C8A—C9A—C10A | −0.9 (5) | C13B—C8B—C9B—C10B | 0.3 (5) |
C7A—C8A—C9A—C10A | 178.4 (3) | C7B—C8B—C9B—C10B | −175.4 (3) |
C8A—C9A—C10A—C11A | −0.2 (5) | C8B—C9B—C10B—C11B | 0.4 (5) |
C9A—C10A—C11A—C12A | 1.1 (5) | C9B—C10B—C11B—C12B | −0.6 (5) |
C10A—C11A—C12A—C13A | −1.0 (5) | C10B—C11B—C12B—C13B | 0.2 (5) |
C11A—C12A—C13A—C8A | −0.2 (5) | C9B—C8B—C13B—C12B | −0.7 (5) |
C9A—C8A—C13A—C12A | 1.1 (5) | C7B—C8B—C13B—C12B | 175.0 (3) |
C7A—C8A—C13A—C12A | −178.3 (3) | C11B—C12B—C13B—C8B | 0.5 (5) |
N3A—N4A—C14A—C15A | 40.3 (3) | N3B—N4B—C14B—C16B | 176.4 (2) |
C5A—N4A—C14A—C15A | 164.9 (2) | C5B—N4B—C14B—C16B | −63.2 (3) |
N3A—N4A—C14A—C16A | 160.2 (2) | N3B—N4B—C14B—C15B | 56.5 (3) |
C5A—N4A—C14A—C16A | −75.2 (3) | C5B—N4B—C14B—C15B | 176.9 (2) |
Experimental details
Crystal data |
Chemical formula | C13H18N2O2 |
Mr | 234.29 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 100 |
a, b, c (Å) | 9.6423 (14), 11.4974 (17), 22.600 (3) |
V (Å3) | 2505.5 (6) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.43 × 0.23 × 0.23 |
|
Data collection |
Diffractometer | Bruker SMART APEX CCD diffractometer |
Absorption correction | Multi-scan SADABS in SAINT-Plus (Bruker, 2003) |
Tmin, Tmax | 0.965, 0.981 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 25602, 3499, 3403 |
Rint | 0.041 |
(sin θ/λ)max (Å−1) | 0.667 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.133, 1.32 |
No. of reflections | 3499 |
No. of parameters | 307 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.37, −0.25 |
Selected geometric parameters (Å, º) topC2A—N3A | 1.340 (4) | C2B—N3B | 1.346 (4) |
| | | |
C14A—N4A—C5A—C7A | 155.5 (2) | C14B—N4B—C5B—C7B | 159.1 (2) |
The synthesis (Hitchcock et al., 2001), conformational analysis (Casper, Blackburn et al., 2002; Burgeson et al. 2004), and asymmetric applications (Casper & Hitchcock, 2003; Casper, Burgeson et al., 2002; Ferrence et al. 2003; Hitchcock et al. 2004; Hitchcock et al. 2001; Squire et al. 2005; Szczepura et al. 2004) of 3,4,5,6-tetrahydro-2H-1,3,4-oxadiazinan-2-ones have only thoroughly been studied in the last ten years. We have been interested in synthesizing new oxadiazinanones for use as chiral auxillaries in aldol addition reactions. We synthesized the title compound in order to study the conformation that the heterocycle adopts. Herein we report the single-crystal X-ray structure analysis of the N4-isopropyl-L-phenylalanine based oxiadiazinanone.
Other oxadiazinanones have been reported and studied, but the title compound is one of few studied that is not substituted at the N3 position. Other oxadiazinanone structures (Burgeson et al., 2004; Casper, Blackburn et al., 2002; Casper, Burgeson et al., 2002; Ferrence et al., 2003; Hitchcock et al., 2001, 2004) are substituted with a carbonyl at the N3 position. These N3 substituted oxadiazinanones adopt a twist-boat conformation, as does the title compound. This is also consistent with related oxadiazinanones not substituted at the N3 position (Szczepura et al., 2004). The C7B—C5B—N4B—C14B torsion angle is 159.1 (2)°, and the C7A—C5A—N4A—C14A torsion angle is 155.5 (2)°. Previously reported oxadiazinanones with no substitution at the N3 position have torsion angles between 161.79–163.16°. A Mogul (Bruno et al. 2004) geometry check showed all non-H bond angles and distances to be normal. The molecular structure (Fig. 1.) of I includes two independent molecules in the asymmetric unit. The oxadiazinanone moieties are essentially isostructural. The primary difference between the two molecules is the orientation of the benzyl group attached to C5A/B (Figs. 2. and 3.). The respective -56.9 (3)° N4A—C5A—C7B—C8A and -175.5 (2)° N4A—C5A—C7B—C8A torsion angles quantify this difference.
Hydrogen-bonding interactions usually appear to play a key role in the crystal packing of oxadiazinanones (Szczepura et al., 2004). However, it may be that the optimal crystal packing simply happens to yield an arrangement of molecules which are suggestive of a hydrogen bonding motif. That is packing forces other than formation of the weak H-bonding fortuitously lead to the motif. In the title compound, the 2.83 Å N3A—O17B and 2.89 Å N3B—O17A donor to acceptor separations are large enough to support only weak, if any, hydrogen bonding (Fig 4.). This interaction is further illustrated in the Jmol enhanced figure (Fig. 5).