3-Hydr­oxy-7,8-dimethoxy­quinolin-2(1H)-one

In the crystal structure of the title compound, C₁₁H₁₁NO₄, intra­molecular O—H...O hydrogen bonding results in the formation of a planar five-membered ring, which is nearly coplanar with the quinoline group. Inter­molecular N—H...O hydrogen bonds link the mol­ecules into centrosymmetric dimers.

Key indicators

• Single-crystal X-ray study
• T = 294 K
• Mean [sigma](C-C) = 0.003 Å
• R factor = 0.054
• wR factor = 0.175
• Data-to-parameter ratio = 14.9

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT029_ALERT_3_C _diffrn_measured_fraction_theta_full Low .......       0.98
PLAT066_ALERT_1_C Predicted and Reported Transmissions Identical .          ?

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   2 ALERT level C = Check and explain
   0 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
   0 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

---

S1. Comment

Quinolin-2(1H)-ones can exist in both the lactam and lactim forms (Beak, 1977; Nimlos et al., 1987; Rajnikant et al., 2002). The tautomeric equilibrium of lactam-lactim attracts attention owing to its chemical, biological and theoretical importantce (Johnson, 1996). The title compound, (I), which is a part of the marine natural compound penicilliazine (Lin et al., 2000), was synthesized and characterized by our research group toward the natural product total synthesis. As part of our ongoing studies, we report herein the crystal structure of (I).

The molecule of the title compound, (I), (Fig. 1) adopts a bicyclic lactam-form with one hydroxy and two methoxy groups attached to atoms C2, C8 and C9, respectively. Rings A (N1/C1-C5) and B (C4-C9) are, of course, planar and the dihedral angle between them is A/B = 2.18 (3)°. The intramolecular O-H···O hydrogen bond (Table 1) results in the formation of a planar five-membered ring C (O1/O2/H2/C1/C2). Ring C is oriented with respect to the adjacent rings A and B at dihedral angles of A/C = 1.99 (3)° and B/C = 3.96 (3)°. So, rings A, B and C are nearly coplanar.

In the crystal structure, intermolecular N-H···O hydrogen bonds (Table 1) link the molecules into centrosymmetric dimers (Fig. 2), in which they may be effective in the stabilization of the structure.

Related literature

For general background, see: Beak (1977); Nimlos et al. (1987); Rajnikant et al. (2002); Johnson (1996). For related literature, see: Lin et al. (2000); Song et al. (2006).

S2. Experimental

The title compound, (I), was prepared according to our reported procedure (Song et al., 2006). Suitable crystals were obtained by recrystallization from chloroform/ethyl acetate (1:1) solution (m.p. 436-437 K). Spectroscopic analysis: IR (KBr, νcm^-1): 3442, 3169, 1665, 1638, 1116; ¹H NMR (CDCl₃, δ, p.p.m.): 7.14–7.17(d, 1H, J = 9.0 Hz), 7.07(s, 1H), 6.85-6.88 (d, 1H, J = 9.0 Hz), 6.61(br, OH),3.97 (s, 3H), 3.93 (s, 3H); ¹³C NMR (CDCl₃, δ, p.p.m.): 159.0, 150.2, 143.7, 134.2,127.2,121.1,115.7,112.2, 108.8,60.6,56.0; analysis, calculated for C₁₁H₁₁N₁O₄: C 59.73, H 5.01, N 6.33%; found: C 59.98, H 5.23, N 6.14%.

S3. Refinement

H atom (for NH) was located in a difference syntheses and refined [N-H = 0.90 (3) Å and U_iso(H) = 0.068 (7) Ų]. The remaining H atoms were positioned geometrically, with O-H = 0.82 Å (for OH) and C-H = 0.93 and 0.96 Å for aromatic and methyl H, respectively, and constrained to ride on their parent atoms with U_iso(H) = xU_eq(C,O), where x = 1.2 for aromatic H, and x = 1.5 for all other H atoms.

Computing details

Data collection: SMART (Bruker, 1998); cell refinement: SMART (Bruker, 1998); data reduction: SAINT (Bruker, 1999); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures

	Fig. 1. The molecular structure of the title molecule, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level.
	Fig. 2. A partial packing diagram of (I). Hydrogen bonds are shown as dashed lines.

3-Hydroxy-7,8-dimethoxyquinolin-2(1H)-one

Crystal data

C11H11NO4	F(000) = 464
Mr = 221.21	Dx = 1.420 Mg m^−3
Monoclinic, P21/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 886 reflections
a = 4.9655 (16) Å	θ = 3.1–27.1°
b = 14.084 (5) Å	µ = 0.11 mm^−1
c = 14.888 (5) Å	T = 294 K
β = 96.208 (6)°	Block, colorless
V = 1035.1 (6) Å^3	0.60 × 0.37 × 0.31 mm
Z = 4

Data collection

Bruker CCD area-detector diffractometer	2228 independent reflections
Radiation source: fine-focus sealed tube	1761 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.015
ϕ and ω scans	θmax = 27.1°, θmin = 2.0°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −6→5
Tmin = 0.937, Tmax = 0.967	k = −17→15
6788 measured reflections	l = −18→18

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.054	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.174	H atoms treated by a mixture of independent and constrained refinement
S = 1.08	w = 1/[σ^2(Fo^2) + (0.0907P)^2 + 0.3738P] where P = (Fo^2 + 2Fc^2)/3
2228 reflections	(Δ/σ)max < 0.001
150 parameters	Δρmax = 0.50 e Å^−3
0 restraints	Δρmin = −0.25 e Å^−3

Special details

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.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > 2sigma(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
O1	−0.1615 (3)	0.39255 (11)	1.01266 (11)	0.0616 (5)
O2	−0.2273 (3)	0.20136 (9)	0.97741 (9)	0.0514 (4)
H2	−0.2816	0.2327	1.0182	0.077*
O3	0.6647 (4)	0.48962 (12)	0.67193 (12)	0.0681 (5)
O4	0.3678 (3)	0.54717 (9)	0.80367 (10)	0.0498 (4)
N1	0.1136 (3)	0.41905 (11)	0.90243 (11)	0.0439 (4)
H1	0.119 (5)	0.481 (2)	0.9155 (17)	0.068 (7)*
C1	−0.0380 (4)	0.36225 (14)	0.95063 (13)	0.0458 (5)
C2	−0.0452 (4)	0.26212 (14)	0.92587 (13)	0.0483 (5)
C3	0.0957 (4)	0.22783 (14)	0.86147 (14)	0.0500 (5)
H3A	0.0912	0.1632	0.8488	0.060*
C4	0.2532 (4)	0.28997 (13)	0.81204 (13)	0.0442 (4)
C5	0.2543 (4)	0.38754 (13)	0.83327 (12)	0.0404 (4)
C6	0.4035 (5)	0.26022 (15)	0.74343 (15)	0.0535 (5)
H6A	0.4079	0.1960	0.7290	0.064*
C7	0.5456 (5)	0.32376 (16)	0.69650 (15)	0.0544 (5)
H7A	0.6462	0.3021	0.6514	0.065*
C8	0.5392 (4)	0.42049 (15)	0.71632 (14)	0.0490 (5)
C9	0.3942 (4)	0.45222 (12)	0.78474 (13)	0.0427 (4)
C10	0.6032 (5)	0.58783 (16)	0.85291 (18)	0.0617 (6)
H10A	0.5711	0.6538	0.8638	0.093*
H10B	0.7547	0.5816	0.8184	0.093*
H10C	0.6416	0.5554	0.9095	0.093*
C11	0.8222 (6)	0.4614 (2)	0.60194 (19)	0.0789 (8)
H11A	0.8986	0.5166	0.5766	0.118*
H11B	0.7088	0.4286	0.5557	0.118*
H11C	0.9653	0.4200	0.6265	0.118*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
O1	0.0712 (10)	0.0546 (9)	0.0639 (9)	−0.0102 (7)	0.0302 (8)	−0.0133 (7)
O2	0.0809 (10)	0.0349 (7)	0.0397 (7)	−0.0015 (6)	0.0119 (6)	−0.0009 (5)
O3	0.0819 (12)	0.0579 (10)	0.0713 (10)	0.0009 (8)	0.0395 (9)	0.0048 (7)
O4	0.0549 (8)	0.0341 (7)	0.0615 (8)	0.0020 (6)	0.0117 (6)	−0.0013 (6)
N1	0.0498 (9)	0.0337 (8)	0.0496 (9)	−0.0009 (6)	0.0118 (7)	−0.0058 (6)
C1	0.0491 (10)	0.0431 (10)	0.0463 (10)	−0.0035 (8)	0.0096 (8)	−0.0056 (8)
C2	0.0559 (12)	0.0403 (10)	0.0488 (10)	−0.0069 (8)	0.0063 (9)	0.0001 (8)
C3	0.0620 (12)	0.0332 (9)	0.0552 (11)	−0.0018 (8)	0.0076 (9)	−0.0039 (8)
C4	0.0489 (10)	0.0360 (9)	0.0480 (10)	0.0022 (8)	0.0058 (8)	−0.0042 (7)
C5	0.0415 (9)	0.0371 (9)	0.0427 (9)	0.0037 (7)	0.0045 (7)	−0.0038 (7)
C6	0.0606 (13)	0.0398 (10)	0.0611 (12)	0.0061 (9)	0.0115 (10)	−0.0110 (9)
C7	0.0580 (12)	0.0521 (12)	0.0557 (11)	0.0083 (9)	0.0177 (9)	−0.0081 (9)
C8	0.0507 (11)	0.0471 (11)	0.0507 (11)	0.0033 (8)	0.0129 (9)	0.0029 (8)
C9	0.0452 (10)	0.0353 (9)	0.0480 (10)	0.0039 (7)	0.0061 (8)	−0.0005 (7)
C10	0.0622 (14)	0.0469 (11)	0.0779 (15)	−0.0108 (10)	0.0157 (11)	−0.0078 (10)
C11	0.0848 (18)	0.0863 (19)	0.0728 (16)	−0.0045 (15)	0.0419 (14)	0.0001 (14)

Geometric parameters (Å, º)

O2—H2	0.8200	C5—C4	1.410 (3)
O3—C11	1.425 (3)	C6—C7	1.376 (3)
O4—C9	1.376 (2)	C6—C4	1.393 (3)
O4—C10	1.430 (3)	C6—H6A	0.9300
N1—C1	1.356 (3)	C7—H7A	0.9300
N1—C5	1.379 (2)	C8—O3	1.365 (3)
N1—H1	0.90 (3)	C8—C9	1.384 (3)
C1—O1	1.238 (2)	C8—C7	1.395 (3)
C1—C2	1.457 (3)	C10—H10A	0.9600
C2—O2	1.513 (2)	C10—H10B	0.9600
C3—C2	1.337 (3)	C10—H10C	0.9600
C3—C4	1.430 (3)	C11—H11A	0.9600
C3—H3A	0.9300	C11—H11B	0.9600
C5—C9	1.394 (3)	C11—H11C	0.9600
C2—O2—H2	109.5	C4—C6—H6A	119.3
C8—O3—C11	118.1 (2)	C6—C7—C8	120.21 (19)
C9—O4—C10	113.78 (16)	C6—C7—H7A	119.9
C1—N1—C5	124.09 (16)	C8—C7—H7A	119.9
C1—N1—H1	117.9 (17)	O3—C8—C9	115.29 (18)
C5—N1—H1	118.0 (17)	O3—C8—C7	124.92 (19)
O1—C1—N1	122.64 (18)	C9—C8—C7	119.78 (19)
O1—C1—C2	121.43 (18)	O4—C9—C8	122.25 (17)
N1—C1—C2	115.93 (17)	O4—C9—C5	117.72 (17)
C3—C2—C1	122.03 (18)	C8—C9—C5	119.91 (17)
C3—C2—O2	123.18 (17)	O4—C10—H10A	109.5
C1—C2—O2	114.78 (17)	O4—C10—H10B	109.5
C2—C3—C4	120.40 (18)	H10A—C10—H10B	109.5
C2—C3—H3A	119.8	O4—C10—H10C	109.5
C4—C3—H3A	119.8	H10A—C10—H10C	109.5
C6—C4—C5	117.91 (18)	H10B—C10—H10C	109.5
C6—C4—C3	124.03 (18)	O3—C11—H11A	109.5
C5—C4—C3	118.06 (17)	O3—C11—H11B	109.5
N1—C5—C9	119.87 (16)	H11A—C11—H11B	109.5
N1—C5—C4	119.41 (17)	O3—C11—H11C	109.5
C9—C5—C4	120.72 (17)	H11A—C11—H11C	109.5
C7—C6—C4	121.43 (18)	H11B—C11—H11C	109.5
C7—C6—H6A	119.3
C10—O4—C9—C8	−77.3 (2)	C9—C5—C4—C3	−177.13 (18)
C10—O4—C9—C5	106.8 (2)	N1—C5—C9—O4	−5.1 (3)
C5—N1—C1—O1	179.73 (19)	C4—C5—C9—O4	174.46 (17)
C5—N1—C1—C2	0.4 (3)	N1—C5—C9—C8	178.93 (17)
C1—N1—C5—C9	176.93 (18)	C4—C5—C9—C8	−1.6 (3)
C1—N1—C5—C4	−2.6 (3)	C7—C6—C4—C5	−1.1 (3)
O1—C1—C2—C3	−177.3 (2)	C7—C6—C4—C3	178.2 (2)
N1—C1—C2—C3	2.0 (3)	C4—C6—C7—C8	−0.7 (3)
O1—C1—C2—O2	3.7 (3)	C9—C8—O3—C11	178.7 (2)
N1—C1—C2—O2	−176.97 (16)	C7—C8—O3—C11	−2.2 (4)
C4—C3—C2—C1	−2.1 (3)	O3—C8—C7—C6	−177.6 (2)
C4—C3—C2—O2	176.75 (17)	C9—C8—C7—C6	1.4 (3)
C2—C3—C4—C6	−179.4 (2)	O3—C8—C9—O4	3.0 (3)
C2—C3—C4—C5	−0.1 (3)	C7—C8—C9—O4	−176.09 (19)
N1—C5—C4—C6	−178.29 (18)	O3—C8—C9—C5	178.85 (17)
C9—C5—C4—C6	2.2 (3)	C7—C8—C9—C5	−0.3 (3)
N1—C5—C4—C3	2.4 (3)

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1···O1^i	0.90 (3)	2.07 (3)	2.938 (2)	161 (2)
O2—H2···O1	0.82	2.33	2.756 (2)	113

Symmetry code: (i) −x, −y+1, −z+2.