Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807038354/bh2126sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807038354/bh2126Isup2.hkl |
CCDC reference: 660226
Treatment of 1-(4-methoxyphenyl)-4-(4-nitrophenyl)-3-phenoxyazetidin-2-one with ceric ammonium nitrate (CAN) at 273 K in acetonitrile gave the title N-unsubstituted monocyclic β-lactam (Jarrahpour et al., 2006). Compound (I) was recrystallized from dichloromethane to give light yellow single crystals. The IR spectrum showed the characteristic absorption of β-lactam carbonyl at 1755 cm-1 and the lactam NH at 3383.9 cm-1. The 1H NMR spectrum showed the β-lactam H-4 proton as a doublet at 5.11 p.p.m. (J = 5.50 Hz) and the H-3 proton also as a doublet at 5.71 p.p.m. (J = 5.50 Hz), NH at 6.76 p.p.m. and aromatic H protons at 6.59–8.21 p.p.m.. The 13C NMR spectrum exhibited the following signals: β-lactam C-4 at 55.11, β-lactam C-3 at 88.76, aromatic carbons at 114.23–158.13, and CO of β-lactam at 167.56 p.p.m.·The mass spectrum showed the molecular ion at m/e 284 and the base peak at m/e 191.
The H atom bonded to N atoms was found in a difference map and refined freely. The C-bonded H atoms were included in idealized positions and refined using a riding model approximation with C—H bond lengths set to 0.93 (aromatic CH) or 0.98 Å (methine CH), and with Uiso(H) = 1.2Ueq(C).
β-Lactams are one of the best known and most extensively studied class of compounds due to their biological activity (Bruggink, 2001; Morin & Gorman, 1982; Katritzky et al., 1996; Georg, 1993). The β-lactam class of drugs have revolutionized treatment in medicine (Coyne et al., 2007). In the late 1970's and early 1980's, the first classes of the monocyclic β-lactam antibacterial agents were found in natural sources (Dobrowolski et al., 2004). All β-lactams are based on a β-lactam ring responsible for the antibacterial activity and variable side chains that account for the major differences in their chemical and pharmacological properties (Cha et al., 2006). Monocyclic β-lactams such as nocardicins (Kamiya et al., 1982) and monobactams (Koster et al., 1982) are of interest as they have been found to exhibit antibiotic properties. These compounds can be synthesized by various routes, although the preparation of a N-unsubstituted β-lactam is a common feature (Chan et al., 1995). Apart from their clinical interest, the use of β-lactams as versatile synthons for the preparation of compounds of biological relevance, such as α- and β-amino acids, alkaloids, heterocycles, and taxoids, has triggered a renewed interest in the building of new β-lactam systems (Alcaide et al., 2007). In solution-phase syntheses, CAN has been utilized to remove the p-methoxyphenyl group from the amide nitrogen of β-lactams to generate corresponding N-unsubstituted analogs (Fukuyama et al., 1980; Kronenthal et al., 1982; Jarrahpour & Zarei, 2006). Jarrahpour and coworkers have synthesized some sugar-based monocyclic β-lactams (Jarrahpour & Alvand, 2007). We herein report on the crystal and molecular structures of the title compound, (I).
In (I) (Fig. 1), the four-membered β-lactam ring is nearly planar, with a maximum deviation of 0.013 (1) Å for atom N1. Within the lactam ring, the bond lengths are similar to those observed in our previous studies (Pınar et al., 2006; Akkurt et al., 2006). The four-membered β-lactam ring (N1/C7/C8/C9) in (I) makes dihedral angles of 67.01 (13) and 75.21 (11)°, respectively, with the C1···C6 phenyl and the C10···C15 benzene rings.
A single N—H···O hydrogen bond (Fig. 2) links molecules into centrosymmetric dimers, forming a R22(8) motif (Bernstein et al., 1995).
For related literature, see: Akkurt et al. (2006); Alcaide et al. (2007); Bernstein et al. (1995); Bruggink (2001); Cha et al. (2006); Chan et al. (1995); Coyne et al. (2007); Dobrowolski et al. (2004); Fukuyama et al. (1980); Georg (1993); Jarrahpour & Alvand (2007); Jarrahpour & Zarei (2006); Kamiya et al. (1982); Katritzky et al. (1996); Koster et al. (1982); Kronenthal et al. (1982); Morin & Gorman (1982); Pınar et al. (2006).
Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA; data reduction: X-RED32 (Stoe & Cie, 2002); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
C15H12N2O4 | Z = 2 |
Mr = 284.27 | F(000) = 296 |
Triclinic, P1 | Dx = 1.383 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 6.1548 (7) Å | Cell parameters from 3067 reflections |
b = 9.8007 (11) Å | θ = 2.1–27.9° |
c = 11.9296 (13) Å | µ = 0.10 mm−1 |
α = 80.552 (9)° | T = 296 K |
β = 75.167 (9)° | Prism, light yellow |
γ = 82.188 (9)° | 0.77 × 0.41 × 0.22 mm |
V = 682.86 (14) Å3 |
Stoe IPDS2 diffractometer | 2635 independent reflections |
Radiation source: sealed X-ray tube, 12 x 0.4 mm long-fine focus | 2047 reflections with I > 2σ(I) |
Plane graphite monochromator | Rint = 0.032 |
Detector resolution: 6.67 pixels mm-1 | θmax = 26.0°, θmin = 2.1° |
ω scans | h = −7→7 |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | k = −12→12 |
Tmin = 0.925, Tmax = 0.978 | l = −14→14 |
5874 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.043 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.116 | w = 1/[σ2(Fo2) + (0.0485P)2 + 0.1246P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
2635 reflections | Δρmax = 0.19 e Å−3 |
195 parameters | Δρmin = −0.24 e Å−3 |
0 restraints | Extinction correction: SHELXL97, FC*=KFC[1+0.001XFC2Λ3/SIN(2Θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.028 (4) |
C15H12N2O4 | γ = 82.188 (9)° |
Mr = 284.27 | V = 682.86 (14) Å3 |
Triclinic, P1 | Z = 2 |
a = 6.1548 (7) Å | Mo Kα radiation |
b = 9.8007 (11) Å | µ = 0.10 mm−1 |
c = 11.9296 (13) Å | T = 296 K |
α = 80.552 (9)° | 0.77 × 0.41 × 0.22 mm |
β = 75.167 (9)° |
Stoe IPDS2 diffractometer | 2635 independent reflections |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | 2047 reflections with I > 2σ(I) |
Tmin = 0.925, Tmax = 0.978 | Rint = 0.032 |
5874 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.116 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.19 e Å−3 |
2635 reflections | Δρmin = −0.24 e Å−3 |
195 parameters |
x | y | z | Uiso*/Ueq | ||
O1 | 0.43673 (18) | 0.16127 (12) | 0.32486 (10) | 0.0569 (4) | |
O2 | 0.31243 (19) | −0.00746 (14) | 0.15344 (12) | 0.0669 (5) | |
O3 | 1.0921 (4) | 0.7129 (2) | 0.1750 (2) | 0.1277 (10) | |
O4 | 0.7998 (4) | 0.78343 (17) | 0.11047 (19) | 0.1150 (9) | |
N1 | 0.6469 (2) | 0.09919 (15) | 0.07432 (14) | 0.0586 (5) | |
N2 | 0.9265 (4) | 0.69132 (18) | 0.14639 (16) | 0.0798 (7) | |
C1 | 0.5052 (3) | 0.19644 (19) | 0.41665 (15) | 0.0587 (6) | |
C2 | 0.6992 (4) | 0.1401 (2) | 0.44995 (19) | 0.0765 (8) | |
C3 | 0.7471 (5) | 0.1856 (3) | 0.5453 (2) | 0.1007 (11) | |
C4 | 0.6077 (7) | 0.2836 (4) | 0.6032 (2) | 0.1137 (13) | |
C5 | 0.4185 (6) | 0.3397 (3) | 0.5681 (2) | 0.1074 (13) | |
C6 | 0.3640 (4) | 0.2961 (2) | 0.47587 (18) | 0.0797 (8) | |
C7 | 0.5801 (3) | 0.06734 (16) | 0.25548 (15) | 0.0529 (5) | |
C8 | 0.4792 (3) | 0.04325 (17) | 0.15693 (16) | 0.0540 (5) | |
C9 | 0.7757 (3) | 0.12692 (17) | 0.15498 (15) | 0.0529 (5) | |
C10 | 0.8109 (2) | 0.27613 (16) | 0.15189 (14) | 0.0467 (5) | |
C11 | 0.9911 (3) | 0.30699 (18) | 0.19038 (16) | 0.0548 (5) | |
C12 | 1.0272 (3) | 0.44190 (18) | 0.19040 (16) | 0.0587 (6) | |
C13 | 0.8818 (3) | 0.54697 (17) | 0.15168 (14) | 0.0551 (5) | |
C14 | 0.6991 (3) | 0.52079 (18) | 0.11567 (15) | 0.0598 (6) | |
C15 | 0.6654 (3) | 0.38471 (17) | 0.11566 (15) | 0.0549 (6) | |
H1 | 0.684 (3) | 0.091 (2) | −0.0023 (19) | 0.075 (6)* | |
H2 | 0.79660 | 0.07320 | 0.41010 | 0.0920* | |
H3 | 0.87740 | 0.14780 | 0.56940 | 0.1210* | |
H4 | 0.64140 | 0.31240 | 0.66680 | 0.1360* | |
H5 | 0.32430 | 0.40860 | 0.60680 | 0.1290* | |
H6 | 0.23200 | 0.33390 | 0.45360 | 0.0960* | |
H7 | 0.62810 | −0.01890 | 0.30100 | 0.0630* | |
H9 | 0.91710 | 0.06610 | 0.14960 | 0.0640* | |
H11 | 1.08870 | 0.23500 | 0.21660 | 0.0660* | |
H12 | 1.14830 | 0.46180 | 0.21620 | 0.0700* | |
H14 | 0.60000 | 0.59340 | 0.09170 | 0.0720* | |
H15 | 0.54260 | 0.36560 | 0.09090 | 0.0660* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0555 (6) | 0.0631 (7) | 0.0574 (7) | −0.0073 (5) | −0.0158 (5) | −0.0182 (5) |
O2 | 0.0579 (7) | 0.0690 (8) | 0.0845 (9) | −0.0143 (6) | −0.0215 (6) | −0.0274 (7) |
O3 | 0.1617 (18) | 0.0836 (12) | 0.166 (2) | −0.0607 (12) | −0.0640 (16) | −0.0180 (12) |
O4 | 0.1542 (17) | 0.0467 (9) | 0.1371 (17) | 0.0001 (10) | −0.0286 (13) | −0.0104 (9) |
N1 | 0.0623 (8) | 0.0590 (9) | 0.0615 (9) | −0.0137 (7) | −0.0132 (7) | −0.0248 (7) |
N2 | 0.1102 (14) | 0.0526 (10) | 0.0743 (11) | −0.0222 (10) | −0.0060 (10) | −0.0157 (8) |
C1 | 0.0706 (10) | 0.0604 (10) | 0.0480 (9) | −0.0262 (8) | −0.0115 (8) | −0.0039 (7) |
C2 | 0.0866 (13) | 0.0816 (14) | 0.0718 (13) | −0.0252 (11) | −0.0342 (11) | −0.0021 (10) |
C3 | 0.124 (2) | 0.113 (2) | 0.0853 (17) | −0.0509 (17) | −0.0543 (16) | 0.0080 (15) |
C4 | 0.177 (3) | 0.121 (2) | 0.0630 (15) | −0.071 (2) | −0.0369 (18) | −0.0102 (15) |
C5 | 0.154 (3) | 0.107 (2) | 0.0636 (14) | −0.0338 (19) | −0.0079 (16) | −0.0303 (14) |
C6 | 0.0971 (15) | 0.0826 (14) | 0.0591 (12) | −0.0178 (11) | −0.0053 (10) | −0.0225 (10) |
C7 | 0.0549 (9) | 0.0428 (8) | 0.0668 (11) | −0.0061 (7) | −0.0212 (8) | −0.0124 (7) |
C8 | 0.0528 (8) | 0.0444 (8) | 0.0711 (11) | −0.0040 (7) | −0.0185 (8) | −0.0210 (7) |
C9 | 0.0474 (8) | 0.0475 (9) | 0.0691 (11) | −0.0023 (7) | −0.0169 (7) | −0.0199 (8) |
C10 | 0.0433 (7) | 0.0473 (8) | 0.0512 (9) | −0.0043 (6) | −0.0088 (6) | −0.0156 (7) |
C11 | 0.0444 (8) | 0.0517 (9) | 0.0726 (11) | −0.0020 (7) | −0.0184 (7) | −0.0158 (8) |
C12 | 0.0522 (9) | 0.0596 (10) | 0.0701 (11) | −0.0150 (8) | −0.0137 (8) | −0.0190 (9) |
C13 | 0.0673 (10) | 0.0476 (9) | 0.0493 (9) | −0.0132 (7) | −0.0035 (7) | −0.0140 (7) |
C14 | 0.0720 (11) | 0.0496 (9) | 0.0580 (10) | 0.0049 (8) | −0.0202 (8) | −0.0094 (7) |
C15 | 0.0555 (9) | 0.0563 (10) | 0.0590 (10) | −0.0020 (7) | −0.0223 (7) | −0.0149 (8) |
O1—C1 | 1.377 (2) | C10—C15 | 1.382 (2) |
O1—C7 | 1.402 (2) | C10—C11 | 1.389 (2) |
O2—C8 | 1.212 (2) | C11—C12 | 1.370 (3) |
O3—N2 | 1.209 (4) | C12—C13 | 1.371 (3) |
O4—N2 | 1.208 (3) | C13—C14 | 1.370 (3) |
N1—C8 | 1.339 (2) | C14—C15 | 1.377 (2) |
N1—C9 | 1.471 (2) | C2—H2 | 0.9300 |
N2—C13 | 1.466 (3) | C3—H3 | 0.9300 |
N1—H1 | 0.90 (2) | C4—H4 | 0.9300 |
C1—C6 | 1.375 (3) | C5—H5 | 0.9300 |
C1—C2 | 1.371 (3) | C6—H6 | 0.9300 |
C2—C3 | 1.398 (3) | C7—H7 | 0.9800 |
C3—C4 | 1.351 (5) | C9—H9 | 0.9800 |
C4—C5 | 1.354 (5) | C11—H11 | 0.9300 |
C5—C6 | 1.374 (4) | C12—H12 | 0.9300 |
C7—C8 | 1.526 (3) | C14—H14 | 0.9300 |
C7—C9 | 1.565 (3) | C15—H15 | 0.9300 |
C9—C10 | 1.500 (2) | ||
O1···O2 | 3.1236 (18) | C12···C14vii | 3.589 (3) |
O1···N1 | 3.063 (2) | C14···C12vii | 3.589 (3) |
O1···C15 | 3.202 (2) | C15···O1 | 3.202 (2) |
O2···C9i | 3.383 (2) | C2···H7 | 2.7000 |
O2···O1 | 3.1236 (18) | C3···H7ix | 3.0400 |
O2···O3ii | 3.165 (3) | C4···H7ix | 3.0600 |
O2···N1iii | 2.940 (2) | C7···H2 | 2.5500 |
O3···O2iv | 3.165 (3) | C8···H1iii | 2.87 (2) |
O4···C8v | 3.037 (3) | C8···H11i | 2.8500 |
O4···N1v | 3.103 (2) | C9···H2 | 3.0400 |
O1···H11i | 2.7300 | C13···H5x | 2.9100 |
O2···H9i | 2.4500 | H1···O2iii | 2.09 (2) |
O2···H11i | 2.7000 | H1···O3vii | 2.79 (2) |
O2···H1iii | 2.09 (2) | H1···C8iii | 2.87 (2) |
O3···H4vi | 2.7600 | H2···C7 | 2.5500 |
O3···H12 | 2.4200 | H2···C9 | 3.0400 |
O3···H1vii | 2.79 (2) | H2···H7 | 2.2200 |
O4···H14 | 2.4400 | H4···O3vi | 2.7600 |
N1···O1 | 3.063 (2) | H5···C13x | 2.9100 |
N1···O4viii | 3.103 (2) | H7···C2 | 2.7000 |
N1···O2iii | 2.940 (2) | H7···H2 | 2.2200 |
N1···H15 | 2.6300 | H7···C3ix | 3.0400 |
C1···C10 | 3.267 (2) | H7···C4ix | 3.0600 |
C2···C9 | 3.450 (3) | H9···O2xi | 2.4500 |
C2···C10 | 3.512 (3) | H9···H11 | 2.4200 |
C2···C11 | 3.432 (3) | H11···O1xi | 2.7300 |
C3···C7ix | 3.581 (3) | H11···O2xi | 2.7000 |
C5···C5x | 3.445 (4) | H11···C8xi | 2.8500 |
C7···C3ix | 3.581 (3) | H11···H9 | 2.4200 |
C8···O4viii | 3.037 (3) | H12···O3 | 2.4200 |
C9···C2 | 3.450 (3) | H14···O4 | 2.4400 |
C9···O2xi | 3.383 (2) | H14···H15xii | 2.5000 |
C10···C2 | 3.512 (3) | H15···N1 | 2.6300 |
C10···C1 | 3.267 (2) | H15···H14xii | 2.5000 |
C11···C2 | 3.432 (3) | ||
C1—O1—C7 | 118.37 (14) | N2—C13—C14 | 119.22 (17) |
C8—N1—C9 | 96.21 (14) | N2—C13—C12 | 118.87 (18) |
O3—N2—O4 | 122.8 (2) | C12—C13—C14 | 121.90 (16) |
O3—N2—C13 | 118.55 (19) | C13—C14—C15 | 118.61 (17) |
O4—N2—C13 | 118.6 (2) | C10—C15—C14 | 121.12 (17) |
C9—N1—H1 | 133.2 (13) | C1—C2—H2 | 121.00 |
C8—N1—H1 | 127.4 (13) | C3—C2—H2 | 121.00 |
O1—C1—C6 | 115.25 (17) | C2—C3—H3 | 119.00 |
O1—C1—C2 | 124.64 (17) | C4—C3—H3 | 119.00 |
C2—C1—C6 | 120.10 (18) | C3—C4—H4 | 120.00 |
C1—C2—C3 | 118.4 (2) | C5—C4—H4 | 120.00 |
C2—C3—C4 | 121.3 (3) | C4—C5—H5 | 120.00 |
C3—C4—C5 | 119.6 (3) | C6—C5—H5 | 120.00 |
C4—C5—C6 | 120.8 (3) | C1—C6—H6 | 120.00 |
C1—C6—C5 | 119.8 (2) | C5—C6—H6 | 120.00 |
O1—C7—C8 | 111.02 (15) | O1—C7—H7 | 113.00 |
O1—C7—C9 | 117.47 (13) | C8—C7—H7 | 113.00 |
C8—C7—C9 | 85.24 (13) | C9—C7—H7 | 113.00 |
O2—C8—N1 | 133.27 (18) | N1—C9—H9 | 112.00 |
N1—C8—C7 | 92.45 (14) | C7—C9—H9 | 112.00 |
O2—C8—C7 | 134.29 (17) | C10—C9—H9 | 112.00 |
N1—C9—C10 | 116.21 (14) | C10—C11—H11 | 120.00 |
C7—C9—C10 | 116.46 (14) | C12—C11—H11 | 119.00 |
N1—C9—C7 | 86.05 (13) | C11—C12—H12 | 121.00 |
C11—C10—C15 | 118.48 (15) | C13—C12—H12 | 121.00 |
C9—C10—C11 | 119.25 (14) | C13—C14—H14 | 121.00 |
C9—C10—C15 | 122.23 (14) | C15—C14—H14 | 121.00 |
C10—C11—C12 | 121.01 (17) | C10—C15—H15 | 119.00 |
C11—C12—C13 | 118.85 (18) | C14—C15—H15 | 119.00 |
C7—O1—C1—C2 | −3.9 (3) | C8—C7—C9—N1 | 1.65 (12) |
C7—O1—C1—C6 | 175.69 (16) | C8—C7—C9—C10 | 119.04 (15) |
C1—O1—C7—C8 | −178.78 (14) | O1—C7—C8—N1 | 115.82 (15) |
C1—O1—C7—C9 | −83.06 (19) | O1—C7—C9—C10 | 7.8 (2) |
C9—N1—C8—O2 | −177.7 (2) | C9—C7—C8—O2 | 177.9 (2) |
C8—N1—C9—C10 | −119.51 (16) | C9—C7—C8—N1 | −1.81 (13) |
C9—N1—C8—C7 | 1.93 (14) | O1—C7—C9—N1 | −109.59 (16) |
C8—N1—C9—C7 | −1.89 (13) | N1—C9—C10—C15 | 25.4 (2) |
O3—N2—C13—C12 | 0.9 (3) | C7—C9—C10—C11 | 104.01 (19) |
O4—N2—C13—C14 | 0.2 (3) | C7—C9—C10—C15 | −73.7 (2) |
O4—N2—C13—C12 | 178.9 (2) | N1—C9—C10—C11 | −156.84 (16) |
O3—N2—C13—C14 | −177.8 (2) | C9—C10—C11—C12 | −179.13 (16) |
O1—C1—C6—C5 | −179.2 (2) | C15—C10—C11—C12 | −1.3 (3) |
C6—C1—C2—C3 | 0.6 (3) | C9—C10—C15—C14 | 178.79 (16) |
O1—C1—C2—C3 | −179.8 (2) | C11—C10—C15—C14 | 1.0 (3) |
C2—C1—C6—C5 | 0.4 (3) | C10—C11—C12—C13 | 0.0 (3) |
C1—C2—C3—C4 | −0.6 (4) | C11—C12—C13—N2 | −177.11 (17) |
C2—C3—C4—C5 | −0.4 (5) | C11—C12—C13—C14 | 1.5 (3) |
C3—C4—C5—C6 | 1.4 (5) | N2—C13—C14—C15 | 176.84 (16) |
C4—C5—C6—C1 | −1.4 (4) | C12—C13—C14—C15 | −1.8 (3) |
O1—C7—C8—O2 | −64.5 (2) | C13—C14—C15—C10 | 0.5 (3) |
Symmetry codes: (i) x−1, y, z; (ii) x−1, y−1, z; (iii) −x+1, −y, −z; (iv) x+1, y+1, z; (v) x, y+1, z; (vi) −x+2, −y+1, −z+1; (vii) −x+2, −y+1, −z; (viii) x, y−1, z; (ix) −x+1, −y, −z+1; (x) −x+1, −y+1, −z+1; (xi) x+1, y, z; (xii) −x+1, −y+1, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O2iii | 0.90 (2) | 2.09 (2) | 2.940 (2) | 156.9 (18) |
C9—H9···O2xi | 0.98 | 2.45 | 3.383 (2) | 159 |
Symmetry codes: (iii) −x+1, −y, −z; (xi) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C15H12N2O4 |
Mr | 284.27 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 296 |
a, b, c (Å) | 6.1548 (7), 9.8007 (11), 11.9296 (13) |
α, β, γ (°) | 80.552 (9), 75.167 (9), 82.188 (9) |
V (Å3) | 682.86 (14) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.77 × 0.41 × 0.22 |
Data collection | |
Diffractometer | Stoe IPDS2 |
Absorption correction | Integration (X-RED32; Stoe & Cie, 2002) |
Tmin, Tmax | 0.925, 0.978 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5874, 2635, 2047 |
Rint | 0.032 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.116, 1.03 |
No. of reflections | 2635 |
No. of parameters | 195 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.19, −0.24 |
Computer programs: X-AREA (Stoe & Cie, 2002), X-AREA, X-RED32 (Stoe & Cie, 2002), SIR97 (Altomare et al., 1999), SHELXL97 (Sheldrick, 1997), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O2i | 0.90 (2) | 2.09 (2) | 2.940 (2) | 156.9 (18) |
C9—H9···O2ii | 0.98 | 2.45 | 3.383 (2) | 159 |
Symmetry codes: (i) −x+1, −y, −z; (ii) x+1, y, z. |
β-Lactams are one of the best known and most extensively studied class of compounds due to their biological activity (Bruggink, 2001; Morin & Gorman, 1982; Katritzky et al., 1996; Georg, 1993). The β-lactam class of drugs have revolutionized treatment in medicine (Coyne et al., 2007). In the late 1970's and early 1980's, the first classes of the monocyclic β-lactam antibacterial agents were found in natural sources (Dobrowolski et al., 2004). All β-lactams are based on a β-lactam ring responsible for the antibacterial activity and variable side chains that account for the major differences in their chemical and pharmacological properties (Cha et al., 2006). Monocyclic β-lactams such as nocardicins (Kamiya et al., 1982) and monobactams (Koster et al., 1982) are of interest as they have been found to exhibit antibiotic properties. These compounds can be synthesized by various routes, although the preparation of a N-unsubstituted β-lactam is a common feature (Chan et al., 1995). Apart from their clinical interest, the use of β-lactams as versatile synthons for the preparation of compounds of biological relevance, such as α- and β-amino acids, alkaloids, heterocycles, and taxoids, has triggered a renewed interest in the building of new β-lactam systems (Alcaide et al., 2007). In solution-phase syntheses, CAN has been utilized to remove the p-methoxyphenyl group from the amide nitrogen of β-lactams to generate corresponding N-unsubstituted analogs (Fukuyama et al., 1980; Kronenthal et al., 1982; Jarrahpour & Zarei, 2006). Jarrahpour and coworkers have synthesized some sugar-based monocyclic β-lactams (Jarrahpour & Alvand, 2007). We herein report on the crystal and molecular structures of the title compound, (I).
In (I) (Fig. 1), the four-membered β-lactam ring is nearly planar, with a maximum deviation of 0.013 (1) Å for atom N1. Within the lactam ring, the bond lengths are similar to those observed in our previous studies (Pınar et al., 2006; Akkurt et al., 2006). The four-membered β-lactam ring (N1/C7/C8/C9) in (I) makes dihedral angles of 67.01 (13) and 75.21 (11)°, respectively, with the C1···C6 phenyl and the C10···C15 benzene rings.
A single N—H···O hydrogen bond (Fig. 2) links molecules into centrosymmetric dimers, forming a R22(8) motif (Bernstein et al., 1995).