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ISSN: 2056-9890

Ethyl 3-amino-1-phenyl-1H-benzo[f]chromene-2-carboxyl­ate

aSchool of Chemistry and Material Engineering, Huangshi Institute of Technology, Huangshi 435003, People's Republic of China, and bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: jiaoyuanhong1995@yahoo.com.cn

(Received 5 March 2009; accepted 11 March 2009; online 14 March 2009)

The pyranyl ring of the title compound, C22H19NO3, adopts a flattened-boat conformation. The dihedral angle between naphthalene and phenyl rings is 78.3 (1)°The mol­ecule also features an intra­molecular N—H⋯Ocarbon­yl hydrogen bond. Adjacent mol­ecules are linked by an inter­molecular N—H⋯Ocarbon­yl hydrogen bond, forming a zigzag chain that runs along the c axis.

Related literature

For the crystal structures of other ethyl 3-amino-1-aryl-1H-benzo[f]chromene-2-carboxyl­ate derivatives, see: Klokol et al. (1987[Klokol, G. V., Sharanina, L. G., Nesterov, V. N., Shklover, V. E., Sharanin, Yu. A. & Struchkov, Yu. T. (1987). Russ. J. Org. Chem. 23, 412-421.]); Shi et al. (2003a[Shi, D.-Q., Wang, J., Wang, X., Zhuang, Q. & Yu, K. (2003a). Acta Cryst. E59, o1733-o1734.],b[Shi, D., Wu, H., Wang, X., Zhuang, Q. & Hu, H. (2003b). Acta Cryst. E59, o1263-o1264.]); Wang et al. (2003[Wang, X.-S., Shi, D.-Q. & Tu, S.-J. (2003). Chin. J. Chem. 21, 1114-1117.]); Zhuang et al. (2003a[Zhuang, Q.-Y., Rong, L.-C., Wang, J.-X., Tu, S.-J., Wang, X.-S. & Shi, D.-Q. (2003a). Chin. J. Org. Chem. 23, 671-673.],b[Zhuang, Q.-Y., Zhang, S., Shi, D.-Q., Tu, S.-J. & Wang, X.-S. (2003b). J. Xuzhou Normal Univ. (Natur. Sci.), 21, 49-52.]).

[Scheme 1]

Experimental

Crystal data
  • C22H19NO3

  • Mr = 345.38

  • Monoclinic, C c

  • a = 13.7835 (5) Å

  • b = 14.6460 (4) Å

  • c = 8.8713 (2) Å

  • β = 99.551 (1)°

  • V = 1766.05 (9) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 0.09 mm−1

  • T = 153 K

  • 0.36 × 0.25 × 0.14 mm

Data collection
  • Rigaku R-AXIS RAPID diffractometer

  • Absorption correction: multi-scan (ABSCOR; Higashi, 1995[Higashi, T. (1995). ABSCOR. Rigaku Corporation, Tokyo, Japan.]) Tmin = 0.864, Tmax = 0.988

  • 8563 measured reflections

  • 2029 independent reflections

  • 1958 reflections with I > 2σ(I)

  • Rint = 0.016

Refinement
  • R[F2 > 2σ(F2)] = 0.030

  • wR(F2) = 0.078

  • S = 1.09

  • 2029 reflections

  • 244 parameters

  • 4 restraints

  • H atoms treated by a mixture of independent and constrained refinement

  • Δρmax = 0.19 e Å−3

  • Δρmin = −0.27 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
N1—H11⋯O3i 0.88 (1) 2.05 (1) 2.907 (2) 166 (2)
N1—H12⋯O3 0.88 (1) 2.07 (2) 2.707 (2) 129 (2)
Symmetry code: (i) [x, -y+2, z+{\script{1\over 2}}].

Data collection: RAPID-AUTO (Rigaku, 1998[Rigaku (1998). RAPID-AUTO. Rigaku Corporation, Tokyo, Japan.]); cell refinement: RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002[Rigaku/MSC (2002). CrystalStructure. Rigaku/MSC, The Woodlands, Texas, USA.]); program(s) used to solve structure: SHELXS97 (Sheldrick 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: X-SEED (Barbour, 2001[Barbour, L. J. (2001). J. Supramol. Chem. 1, 189-191.]); software used to prepare material for publication: publCIF (Westrip, 2009[Westrip, S. P. (2009). publCIF. In preparation.]).

Supporting information


Comment top

2-Naphthol, substituted benzaldehydes and ethyl 2-cyanoacetate react in the presence of a catalyst to form the ethyl 3-amino-1-aryl-1H-benzo[f]chromene-2-carboxylates; the compounds possess a primary amine group. The crystal structures of several 1-aryl derivatives have been reported (Klokol et al., 1987; Shi et al., 2003a; Shi et al., 2003b; Wang et al., 2003; Zhuang et al., 2003a; Zhuang et al., 2003b). Interestingly, the crystal structure of the unsubstituted 1-phenyl compound was not known, and its structure is reported here. The title compound (Scheme I, Fig. 1) exhibits a pyranyl ring in a flattened boat conformation. The molecule also features an intramolecular NH···Ocarbonyl bond. Adjacent molecules are linked by an intermolecular N—H···Ocarbonyl hydrogen bond to furnish a zigzag chain that runs along the c-axis.

Related literature top

For the crystal structures of other ethyl 3-amino-1-aryl-1H-benzo[f]chromene-2-carboxylate derivatives, see: Klokol et al. (1987); Shi et al. (2003a,b); Wang et al. (2003); Zhuang et al. (2003a,b).

Experimental top

2-Naphthol (1.4 g, 10 mmol), benzaldehyde (1.1 g, 10 mmol), ethyl 2-cyanoacetate (1.0 g, 10 mmol) and piperidine (1 ml) were dissolved in ethanol (30 ml). The solution was heated for 5 h. The solvent was removed under reduced pressure and and the residue recrystallized from dichloromethane/methanol (1:1/v:v) to give yellow crystals in 80% yield; m.p. 436–437 K.

Refinement top

In the absence of significant anomalous scattering Friedel pairs were merged prior to refinement and the absolute configuration of the molecule was not refined. Carbon-bound H atoms were placed in calculated positions [C—H 0.95–1.00 Å and Uiso(H) 1.2–1.5Ueq(C)], and were included in the refinement in the riding-model approximation. The amino H-atoms were located in a difference Fourier map, and were refined with an N–H distance restraint of 0.88 (1) Å; their isotropic temperature factures were refined.

Computing details top

Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2009).

Figures top
[Figure 1] Fig. 1. Thermal ellipsoid plot (Barbour, 2001) of C22H19NO3; displacement ellipsoids are drawn at the 70% probability level, and H atoms as spheres of arbitrary radius.
[Figure 2] Fig. 2. Thermal ellipsoid plot (Barbour, 2001) showing the intra and intermolecular hydrogen bonding interactions (dashed lines); displacement ellipsoids are drawn at the 70% probability level, and H atoms as spheres of arbitrary radius.
Ethyl 3-amino-1-phenyl-1H-benzo[f]chromene-2-carboxylate top
Crystal data top
C22H19NO3F(000) = 728
Mr = 345.38Dx = 1.299 Mg m3
Monoclinic, CcMo Kα radiation, λ = 0.71073 Å
Hall symbol: C -2ycCell parameters from 8058 reflections
a = 13.7835 (5) Åθ = 3.0–27.5°
b = 14.6460 (4) ŵ = 0.09 mm1
c = 8.8713 (2) ÅT = 153 K
β = 99.551 (1)°Block, yellow
V = 1766.05 (9) Å30.36 × 0.25 × 0.14 mm
Z = 4
Data collection top
Rigaku R-AXIS RAPID
diffractometer
2029 independent reflections
Radiation source: fine-focus sealed tube1958 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.016
Detector resolution: 10.000 pixels mm-1θmax = 27.5°, θmin = 3.0°
ω scansh = 1717
Absorption correction: multi-scan
(ABSCOR; Higashi, 1995)
k = 1818
Tmin = 0.864, Tmax = 0.988l = 1011
8563 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.030Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.078H atoms treated by a mixture of independent and constrained refinement
S = 1.09 w = 1/[σ2(Fo2) + (0.0522P)2 + 0.3553P]
where P = (Fo2 + 2Fc2)/3
2029 reflections(Δ/σ)max = 0.001
244 parametersΔρmax = 0.19 e Å3
4 restraintsΔρmin = 0.27 e Å3
Crystal data top
C22H19NO3V = 1766.05 (9) Å3
Mr = 345.38Z = 4
Monoclinic, CcMo Kα radiation
a = 13.7835 (5) ŵ = 0.09 mm1
b = 14.6460 (4) ÅT = 153 K
c = 8.8713 (2) Å0.36 × 0.25 × 0.14 mm
β = 99.551 (1)°
Data collection top
Rigaku R-AXIS RAPID
diffractometer
2029 independent reflections
Absorption correction: multi-scan
(ABSCOR; Higashi, 1995)
1958 reflections with I > 2σ(I)
Tmin = 0.864, Tmax = 0.988Rint = 0.016
8563 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0304 restraints
wR(F2) = 0.078H atoms treated by a mixture of independent and constrained refinement
S = 1.09Δρmax = 0.19 e Å3
2029 reflectionsΔρmin = 0.27 e Å3
244 parameters
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
O10.50000 (10)0.89966 (8)0.50000 (13)0.0251 (3)
O20.57192 (9)0.73346 (8)0.07916 (12)0.0221 (3)
O30.57203 (10)0.88667 (8)0.05998 (13)0.0243 (3)
N10.54563 (13)0.98073 (10)0.31277 (17)0.0289 (3)
H110.5480 (18)1.0271 (12)0.376 (2)0.038 (7)*
H120.5641 (18)0.9858 (18)0.2234 (17)0.040 (7)*
C10.53026 (11)0.72524 (11)0.36834 (17)0.0176 (3)
H10.49680.68100.29080.021*
C20.63064 (12)0.68559 (10)0.43558 (18)0.0199 (3)
C30.66322 (13)0.60409 (11)0.3813 (2)0.0254 (4)
H30.62280.57280.30040.031*
C40.75447 (14)0.56763 (13)0.4441 (3)0.0335 (4)
H40.77590.51180.40600.040*
C50.81378 (14)0.61264 (14)0.5619 (3)0.0364 (5)
H50.87560.58740.60560.044*
C60.78287 (14)0.69460 (15)0.6159 (2)0.0357 (5)
H60.82390.72600.69590.043*
C70.69180 (13)0.73093 (13)0.5532 (2)0.0276 (4)
H70.67110.78710.59080.033*
C80.46549 (12)0.73777 (11)0.48933 (17)0.0191 (3)
C90.41664 (12)0.66266 (12)0.54835 (17)0.0204 (3)
C100.43046 (13)0.57101 (12)0.50594 (18)0.0247 (3)
H100.47320.55800.43490.030*
C110.38294 (15)0.50035 (13)0.5660 (2)0.0305 (4)
H11A0.39410.43920.53780.037*
C120.31800 (14)0.51858 (14)0.6691 (2)0.0322 (4)
H12A0.28400.46980.70790.039*
C130.30372 (14)0.60584 (14)0.7134 (2)0.0297 (4)
H130.26010.61720.78370.036*
C140.35287 (12)0.68005 (13)0.65636 (19)0.0240 (4)
C150.34044 (13)0.77096 (13)0.7054 (2)0.0278 (4)
H150.29740.78270.77640.033*
C160.38932 (14)0.84127 (13)0.65223 (19)0.0262 (4)
H160.38160.90180.68670.031*
C170.45205 (12)0.82298 (12)0.54462 (18)0.0217 (3)
C180.53012 (12)0.89655 (11)0.36102 (17)0.0213 (3)
C190.53928 (12)0.81562 (10)0.28807 (18)0.0186 (3)
C200.56246 (12)0.81763 (10)0.13523 (18)0.0185 (3)
C210.59893 (13)0.72831 (11)0.07209 (18)0.0239 (3)
H21A0.66440.75610.07170.029*
H21B0.55020.76110.14750.029*
C220.60081 (17)0.62865 (13)0.1116 (2)0.0336 (4)
H22A0.53450.60310.11830.050*
H22B0.64590.59640.03210.050*
H22C0.62320.62140.21010.050*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O10.0364 (7)0.0209 (6)0.0193 (5)0.0010 (5)0.0086 (5)0.0031 (4)
O20.0328 (6)0.0182 (5)0.0168 (5)0.0025 (5)0.0084 (4)0.0014 (4)
O30.0334 (7)0.0200 (6)0.0199 (5)0.0007 (5)0.0059 (5)0.0027 (4)
N10.0473 (9)0.0188 (7)0.0216 (7)0.0023 (6)0.0088 (6)0.0033 (6)
C10.0189 (7)0.0185 (7)0.0156 (6)0.0004 (5)0.0036 (5)0.0004 (5)
C20.0194 (7)0.0223 (7)0.0190 (7)0.0004 (6)0.0061 (5)0.0069 (6)
C30.0223 (8)0.0188 (7)0.0357 (10)0.0010 (6)0.0060 (7)0.0053 (6)
C40.0243 (8)0.0223 (8)0.0553 (12)0.0029 (7)0.0108 (8)0.0109 (8)
C50.0202 (8)0.0387 (11)0.0489 (12)0.0022 (7)0.0012 (8)0.0183 (9)
C60.0245 (9)0.0507 (12)0.0298 (9)0.0019 (8)0.0014 (7)0.0060 (8)
C70.0236 (8)0.0359 (9)0.0230 (8)0.0006 (7)0.0026 (6)0.0006 (7)
C80.0187 (7)0.0215 (7)0.0168 (7)0.0006 (6)0.0024 (6)0.0015 (6)
C90.0187 (7)0.0267 (8)0.0155 (6)0.0001 (6)0.0017 (5)0.0015 (6)
C100.0279 (8)0.0250 (8)0.0221 (8)0.0044 (6)0.0067 (6)0.0003 (6)
C110.0365 (10)0.0277 (8)0.0272 (9)0.0071 (8)0.0053 (7)0.0014 (7)
C120.0309 (9)0.0365 (10)0.0296 (9)0.0103 (7)0.0059 (7)0.0065 (8)
C130.0225 (8)0.0440 (10)0.0239 (8)0.0020 (7)0.0078 (6)0.0057 (7)
C140.0190 (7)0.0320 (9)0.0208 (8)0.0011 (6)0.0030 (6)0.0024 (6)
C150.0241 (8)0.0376 (10)0.0233 (8)0.0063 (7)0.0085 (6)0.0007 (7)
C160.0277 (8)0.0276 (9)0.0240 (8)0.0056 (7)0.0063 (7)0.0033 (7)
C170.0228 (8)0.0251 (8)0.0173 (7)0.0017 (6)0.0031 (6)0.0007 (6)
C180.0254 (8)0.0226 (8)0.0153 (7)0.0002 (6)0.0020 (6)0.0005 (6)
C190.0206 (7)0.0177 (7)0.0169 (7)0.0001 (5)0.0016 (6)0.0018 (5)
C200.0199 (7)0.0173 (7)0.0180 (7)0.0018 (5)0.0021 (5)0.0012 (5)
C210.0330 (9)0.0233 (8)0.0173 (8)0.0011 (7)0.0092 (6)0.0003 (6)
C220.0519 (11)0.0238 (8)0.0280 (9)0.0062 (8)0.0155 (8)0.0017 (7)
Geometric parameters (Å, º) top
O1—C181.3654 (19)C8—C91.433 (2)
O1—C171.393 (2)C9—C101.415 (2)
O2—C201.3437 (19)C9—C141.427 (2)
O2—C211.4527 (18)C10—C111.378 (2)
O3—C201.231 (2)C10—H100.9500
N1—C181.334 (2)C11—C121.407 (3)
N1—H110.876 (10)C11—H11A0.9500
N1—H120.875 (10)C12—C131.361 (3)
C1—C81.517 (2)C12—H12A0.9500
C1—C191.518 (2)C13—C141.418 (3)
C1—C21.528 (2)C13—H130.9500
C1—H11.0000C14—C151.420 (3)
C2—C31.389 (2)C15—C161.357 (3)
C2—C71.396 (2)C15—H150.9500
C3—C41.395 (2)C16—C171.416 (2)
C3—H30.9500C16—H160.9500
C4—C51.382 (3)C18—C191.366 (2)
C4—H40.9500C19—C201.444 (2)
C5—C61.386 (3)C21—C221.502 (2)
C5—H50.9500C21—H21A0.9900
C6—C71.392 (3)C21—H21B0.9900
C6—H60.9500C22—H22A0.9800
C7—H70.9500C22—H22B0.9800
C8—C171.365 (2)C22—H22C0.9800
C18—O1—C17117.34 (13)C12—C11—H11A119.9
C20—O2—C21116.42 (12)C13—C12—C11120.25 (17)
C18—N1—H11120.2 (17)C13—C12—H12A119.9
C18—N1—H12117.1 (17)C11—C12—H12A119.9
H11—N1—H12122 (2)C12—C13—C14121.08 (17)
C8—C1—C19109.27 (13)C12—C13—H13119.5
C8—C1—C2111.78 (13)C14—C13—H13119.5
C19—C1—C2112.04 (12)C13—C14—C15121.35 (16)
C8—C1—H1107.9C13—C14—C9119.15 (16)
C19—C1—H1107.9C15—C14—C9119.50 (15)
C2—C1—H1107.9C16—C15—C14120.85 (16)
C3—C2—C7118.56 (15)C16—C15—H15119.6
C3—C2—C1121.00 (14)C14—C15—H15119.6
C7—C2—C1120.44 (15)C15—C16—C17118.99 (16)
C2—C3—C4120.82 (17)C15—C16—H16120.5
C2—C3—H3119.6C17—C16—H16120.5
C4—C3—H3119.6C8—C17—O1122.40 (14)
C5—C4—C3120.03 (18)C8—C17—C16123.36 (16)
C5—C4—H4120.0O1—C17—C16114.24 (14)
C3—C4—H4120.0N1—C18—O1110.36 (14)
C4—C5—C6119.83 (17)N1—C18—C19128.13 (15)
C4—C5—H5120.1O1—C18—C19121.50 (14)
C6—C5—H5120.1C18—C19—C20118.64 (14)
C5—C6—C7120.10 (18)C18—C19—C1120.87 (14)
C5—C6—H6120.0C20—C19—C1120.42 (13)
C7—C6—H6120.0O3—C20—O2121.82 (15)
C6—C7—C2120.65 (18)O3—C20—C19125.89 (14)
C6—C7—H7119.7O2—C20—C19112.28 (13)
C2—C7—H7119.7O2—C21—C22106.43 (13)
C17—C8—C9118.06 (14)O2—C21—H21A110.4
C17—C8—C1119.73 (14)C22—C21—H21A110.4
C9—C8—C1122.20 (14)O2—C21—H21B110.4
C10—C9—C14118.23 (15)C22—C21—H21B110.4
C10—C9—C8122.59 (15)H21A—C21—H21B108.6
C14—C9—C8119.17 (15)C21—C22—H22A109.5
C11—C10—C9121.04 (16)C21—C22—H22B109.5
C11—C10—H10119.5H22A—C22—H22B109.5
C9—C10—H10119.5C21—C22—H22C109.5
C10—C11—C12120.21 (18)H22A—C22—H22C109.5
C10—C11—H11A119.9H22B—C22—H22C109.5
C8—C1—C2—C3121.86 (16)C8—C9—C14—C151.2 (2)
C19—C1—C2—C3115.10 (16)C13—C14—C15—C16178.73 (17)
C8—C1—C2—C758.27 (19)C9—C14—C15—C160.8 (3)
C19—C1—C2—C764.76 (19)C14—C15—C16—C171.0 (3)
C7—C2—C3—C40.8 (2)C9—C8—C17—O1176.85 (14)
C1—C2—C3—C4179.31 (16)C1—C8—C17—O13.5 (2)
C2—C3—C4—C50.0 (3)C9—C8—C17—C162.7 (2)
C3—C4—C5—C60.8 (3)C1—C8—C17—C16176.99 (16)
C4—C5—C6—C70.8 (3)C18—O1—C17—C824.8 (2)
C5—C6—C7—C20.0 (3)C18—O1—C17—C16155.62 (15)
C3—C2—C7—C60.8 (3)C15—C16—C17—C80.8 (3)
C1—C2—C7—C6179.31 (16)C15—C16—C17—O1178.81 (15)
C19—C1—C8—C1720.86 (19)C17—O1—C18—N1160.53 (15)
C2—C1—C8—C17103.73 (16)C17—O1—C18—C1918.3 (2)
C19—C1—C8—C9158.81 (13)N1—C18—C19—C204.4 (3)
C2—C1—C8—C976.60 (18)O1—C18—C19—C20174.24 (15)
C17—C8—C9—C10175.95 (15)N1—C18—C19—C1172.70 (16)
C1—C8—C9—C104.4 (2)O1—C18—C19—C18.7 (2)
C17—C8—C9—C142.8 (2)C8—C1—C19—C1827.1 (2)
C1—C8—C9—C14176.84 (15)C2—C1—C19—C1897.31 (17)
C14—C9—C10—C110.6 (2)C8—C1—C19—C20155.85 (14)
C8—C9—C10—C11179.41 (15)C2—C1—C19—C2079.71 (17)
C9—C10—C11—C121.2 (3)C21—O2—C20—O33.0 (2)
C10—C11—C12—C131.8 (3)C21—O2—C20—C19177.75 (13)
C11—C12—C13—C140.5 (3)C18—C19—C20—O32.5 (2)
C12—C13—C14—C15178.19 (18)C1—C19—C20—O3179.59 (16)
C12—C13—C14—C91.3 (3)C18—C19—C20—O2178.28 (15)
C10—C9—C14—C131.9 (2)C1—C19—C20—O21.20 (19)
C8—C9—C14—C13179.31 (15)C20—O2—C21—C22177.74 (14)
C10—C9—C14—C15177.66 (15)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1—H11···O3i0.88 (1)2.05 (1)2.907 (2)166 (2)
N1—H12···O30.88 (1)2.07 (2)2.707 (2)129 (2)
Symmetry code: (i) x, y+2, z+1/2.

Experimental details

Crystal data
Chemical formulaC22H19NO3
Mr345.38
Crystal system, space groupMonoclinic, Cc
Temperature (K)153
a, b, c (Å)13.7835 (5), 14.6460 (4), 8.8713 (2)
β (°) 99.551 (1)
V3)1766.05 (9)
Z4
Radiation typeMo Kα
µ (mm1)0.09
Crystal size (mm)0.36 × 0.25 × 0.14
Data collection
DiffractometerRigaku R-AXIS RAPID
diffractometer
Absorption correctionMulti-scan
(ABSCOR; Higashi, 1995)
Tmin, Tmax0.864, 0.988
No. of measured, independent and
observed [I > 2σ(I)] reflections
8563, 2029, 1958
Rint0.016
(sin θ/λ)max1)0.649
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.030, 0.078, 1.09
No. of reflections2029
No. of parameters244
No. of restraints4
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å3)0.19, 0.27

Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick 2008), SHELXL97 (Sheldrick, 2008), X-SEED (Barbour, 2001), publCIF (Westrip, 2009).

Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1—H11···O3i0.88 (1)2.05 (1)2.907 (2)166 (2)
N1—H12···O30.88 (1)2.07 (2)2.707 (2)129 (2)
Symmetry code: (i) x, y+2, z+1/2.
 

Acknowledgements

We thank the Huangshi Institute of Technology (grant No. 08yjz23B) and the University of Malaya for supporting this work.

References

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First citationZhuang, Q.-Y., Rong, L.-C., Wang, J.-X., Tu, S.-J., Wang, X.-S. & Shi, D.-Q. (2003a). Chin. J. Org. Chem. 23, 671–673.  CAS Google Scholar
First citationZhuang, Q.-Y., Zhang, S., Shi, D.-Q., Tu, S.-J. & Wang, X.-S. (2003b). J. Xuzhou Normal Univ. (Natur. Sci.), 21, 49–52.  CAS Google Scholar

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