Literature DB >> 21583620

Methyl 4-(4-methoxy-phen-yl)-1,2,3,3a,4,4a,5,12c-octa-hydro-benzo[f]chromeno[3,4-b]pyrrolizine-4a-carboxyl-ate.

S Nirmala, E Theboral Sugi Kamala, L Sudha, S Kathiravan, R Raghunathan.   

Abstract

In the title compound, C(27)H(27)NO(4), both the pyrrolidine rings in the pyrrolizine ring system adopt envelope conformations, whereas the dihydro-pyran ring adopts a half-chair conformation. The methoxy-phenyl group is oriented at an angle of 53.72 (4)° with respect to the naphthalene ring system. Intra-molecular C-H⋯O hydrogen bonds are observed. The crystal structure is stabilized by weak inter-molecular C-H⋯π inter-actions.

Entities:  

Year:  2009        PMID: 21583620      PMCID: PMC2977484          DOI: 10.1107/S1600536809027639

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For the biological activity of pyrrolizine derivatives, see: Amal Raj et al. (2003 ▶); Atal (1978 ▶); Denny (2001 ▶); Suzuki et al. (1994 ▶). For a related structure, see: Ramesh et al. (2007 ▶). For ring-puckering parameters, see: Cremer & Pople (1975 ▶).

Experimental

Crystal data

C27H27NO4 M = 429.50 Triclinic, a = 8.7484 (4) Å b = 11.4284 (5) Å c = 11.4444 (6) Å α = 104.127 (2)° β = 91.824 (3)° γ = 101.555 (2)° V = 1083.19 (9) Å3 Z = 2 Mo Kα radiation μ = 0.09 mm−1 T = 293 K 0.30 × 0.25 × 0.20 mm

Data collection

Bruker Kappa APEXII area-detector diffractometer Absorption correction: multi-scan (Blessing, 1995 ▶) T min = 0.974, T max = 0.983 22194 measured reflections 4310 independent reflections 2976 reflections with I > 2σ(I) R int = 0.029

Refinement

R[F 2 > 2σ(F 2)] = 0.046 wR(F 2) = 0.131 S = 1.03 4310 reflections 289 parameters H-atom parameters constrained Δρmax = 0.35 e Å−3 Δρmin = −0.16 e Å−3 Data collection: APEX2 (Bruker, 2004 ▶); cell refinement: SAINT (Bruker, 2004 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 (Farrugia, 1997 ▶); software used to prepare material for publication: PLATON (Spek, 2009 ▶). Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809027639/bt5001sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536809027639/bt5001Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C27H27NO4Z = 2
Mr = 429.50F(000) = 456
Triclinic, P1Dx = 1.317 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 8.7484 (4) ÅCell parameters from 6981 reflections
b = 11.4284 (5) Åθ = 2.3–26.0°
c = 11.4444 (6) ŵ = 0.09 mm1
α = 104.127 (2)°T = 293 K
β = 91.824 (3)°Prism, yellow
γ = 101.555 (2)°0.30 × 0.25 × 0.20 mm
V = 1083.19 (9) Å3
Bruker Kappa APEXII area-detector diffractometer4310 independent reflections
Radiation source: fine-focus sealed tube2976 reflections with I > 2σ(I)
graphiteRint = 0.029
ω and φ scansθmax = 26.2°, θmin = 2.3°
Absorption correction: multi-scan (Blessing, 1995)h = −10→10
Tmin = 0.974, Tmax = 0.983k = −14→14
22194 measured reflectionsl = −14→14
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.046Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.131H-atom parameters constrained
S = 1.03w = 1/[σ2(Fo2) + (0.0551P)2 + 0.3082P] where P = (Fo2 + 2Fc2)/3
4310 reflections(Δ/σ)max < 0.001
289 parametersΔρmax = 0.35 e Å3
0 restraintsΔρmin = −0.16 e Å3
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 > σ(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.
xyzUiso*/Ueq
C10.3428 (2)0.57705 (16)0.31111 (15)0.0445 (4)
H10.28660.57520.38360.053*
C20.26413 (19)0.64642 (15)0.23992 (15)0.0431 (4)
C30.2290 (2)0.76283 (16)0.29772 (16)0.0464 (4)
C40.2730 (2)0.82056 (17)0.42105 (17)0.0548 (5)
H40.32840.78340.46690.066*
C50.2352 (3)0.93069 (19)0.4741 (2)0.0657 (6)
H50.26340.96680.55590.079*
C60.1550 (3)0.9895 (2)0.4072 (2)0.0716 (6)
H60.13081.06480.44410.086*
C70.1123 (2)0.93691 (19)0.2880 (2)0.0661 (6)
H70.05940.97700.24370.079*
C80.1466 (2)0.82244 (17)0.23017 (18)0.0521 (5)
C90.0967 (2)0.76322 (19)0.10731 (19)0.0582 (5)
H90.04040.80080.06270.070*
C100.1295 (2)0.65353 (18)0.05396 (17)0.0538 (5)
H100.09450.6155−0.02660.065*
C110.2164 (2)0.59630 (16)0.11972 (16)0.0462 (4)
C120.3576 (2)0.43780 (17)0.10894 (15)0.0479 (4)
H12A0.46150.48510.10430.057*
H12B0.35220.35300.06430.057*
C130.3321 (2)0.44172 (15)0.23988 (14)0.0425 (4)
C140.4659 (2)0.40757 (17)0.30803 (15)0.0477 (4)
H140.42350.39680.38390.057*
C150.5928 (2)0.52759 (18)0.34653 (17)0.0546 (5)
H150.63440.53490.42910.066*
C160.7312 (2)0.5558 (2)0.2738 (2)0.0688 (6)
H16A0.82110.52890.30140.083*
H16B0.70500.51680.18820.083*
C170.7619 (3)0.6949 (2)0.2989 (3)0.0855 (8)
H17A0.81760.73420.37780.103*
H17B0.82150.72390.23760.103*
C180.5994 (3)0.7186 (2)0.2943 (3)0.0773 (7)
H18A0.59850.80250.33860.093*
H18B0.55790.70560.21140.093*
C190.5143 (2)0.28744 (16)0.25383 (15)0.0454 (4)
C200.5936 (2)0.26369 (18)0.15102 (17)0.0542 (5)
H200.61660.32390.10850.065*
C210.6397 (2)0.15321 (18)0.10964 (18)0.0570 (5)
H210.69400.14040.04070.068*
C220.6059 (2)0.06275 (17)0.16960 (19)0.0562 (5)
C230.5197 (3)0.0811 (2)0.2683 (2)0.0646 (6)
H230.49050.01840.30710.077*
C240.4769 (2)0.19191 (19)0.30954 (18)0.0570 (5)
H240.42060.20340.37750.068*
C250.7526 (3)−0.0636 (2)0.0442 (2)0.0881 (8)
H25A0.7767−0.14400.03090.132*
H25B0.8476−0.00150.06630.132*
H25C0.7019−0.0565−0.02860.132*
C260.1780 (2)0.35504 (17)0.24530 (17)0.0488 (4)
C27−0.0206 (3)0.3004 (3)0.3694 (3)0.0902 (8)
H27A−0.05010.32830.44980.135*
H27B−0.00390.21790.35720.135*
H27C−0.10260.30100.31190.135*
N10.50894 (18)0.62899 (14)0.35141 (14)0.0554 (4)
O10.24421 (15)0.48642 (12)0.05440 (10)0.0547 (3)
O20.12217 (17)0.38163 (14)0.35295 (13)0.0697 (4)
O30.11479 (19)0.27038 (15)0.16475 (14)0.0831 (5)
O40.6519 (2)−0.04732 (14)0.13839 (16)0.0803 (5)
U11U22U33U12U13U23
C10.0434 (10)0.0490 (10)0.0396 (9)0.0085 (8)0.0057 (7)0.0093 (8)
C20.0397 (10)0.0457 (10)0.0450 (9)0.0063 (7)0.0072 (7)0.0155 (8)
C30.0380 (10)0.0458 (10)0.0550 (11)0.0044 (7)0.0110 (8)0.0152 (8)
C40.0537 (12)0.0510 (11)0.0574 (11)0.0113 (9)0.0083 (9)0.0091 (9)
C50.0664 (14)0.0559 (12)0.0688 (13)0.0131 (10)0.0135 (11)0.0036 (10)
C60.0648 (14)0.0525 (12)0.0970 (18)0.0187 (10)0.0201 (12)0.0112 (12)
C70.0532 (13)0.0577 (12)0.0948 (17)0.0188 (10)0.0131 (11)0.0267 (12)
C80.0374 (10)0.0532 (11)0.0698 (13)0.0089 (8)0.0118 (9)0.0232 (10)
C90.0466 (11)0.0692 (13)0.0683 (13)0.0148 (9)0.0059 (9)0.0331 (11)
C100.0493 (11)0.0649 (12)0.0495 (10)0.0084 (9)0.0026 (8)0.0223 (9)
C110.0451 (10)0.0483 (10)0.0458 (10)0.0061 (8)0.0076 (8)0.0160 (8)
C120.0557 (11)0.0494 (10)0.0404 (9)0.0138 (8)0.0082 (8)0.0124 (8)
C130.0447 (10)0.0469 (10)0.0368 (9)0.0104 (8)0.0062 (7)0.0117 (7)
C140.0511 (11)0.0567 (11)0.0381 (9)0.0156 (8)0.0078 (8)0.0135 (8)
C150.0521 (11)0.0636 (12)0.0447 (10)0.0167 (9)−0.0008 (8)0.0046 (9)
C160.0547 (13)0.0684 (14)0.0753 (14)0.0125 (10)0.0114 (10)0.0036 (11)
C170.0533 (14)0.0721 (15)0.118 (2)−0.0002 (11)0.0134 (13)0.0102 (14)
C180.0553 (14)0.0623 (13)0.1104 (19)0.0004 (10)0.0123 (12)0.0241 (13)
C190.0459 (10)0.0520 (10)0.0412 (9)0.0129 (8)0.0048 (8)0.0154 (8)
C200.0625 (12)0.0548 (11)0.0531 (11)0.0183 (9)0.0173 (9)0.0220 (9)
C210.0614 (13)0.0594 (12)0.0546 (11)0.0225 (10)0.0146 (9)0.0140 (10)
C220.0542 (12)0.0509 (11)0.0652 (12)0.0184 (9)−0.0026 (10)0.0135 (10)
C230.0704 (14)0.0618 (13)0.0744 (14)0.0199 (11)0.0102 (11)0.0362 (11)
C240.0590 (12)0.0685 (13)0.0535 (11)0.0206 (10)0.0137 (9)0.0273 (10)
C250.0778 (17)0.0780 (16)0.105 (2)0.0431 (13)−0.0010 (14)−0.0032 (14)
C260.0499 (11)0.0510 (11)0.0488 (10)0.0124 (9)0.0060 (8)0.0175 (9)
C270.0667 (16)0.1030 (19)0.111 (2)0.0060 (14)0.0337 (14)0.0537 (17)
N10.0495 (9)0.0541 (9)0.0567 (9)0.0097 (7)0.0010 (7)0.0046 (8)
O10.0679 (9)0.0583 (8)0.0383 (6)0.0175 (6)−0.0014 (6)0.0105 (6)
O20.0631 (9)0.0799 (10)0.0636 (9)0.0022 (7)0.0239 (7)0.0222 (8)
O30.0781 (11)0.0744 (10)0.0743 (10)−0.0156 (8)0.0073 (8)0.0027 (9)
O40.0883 (12)0.0606 (9)0.1009 (12)0.0360 (8)0.0093 (9)0.0210 (9)
C1—N11.468 (2)C15—C161.517 (3)
C1—C21.505 (2)C15—H150.9800
C1—C131.545 (2)C16—C171.511 (3)
C1—H10.9800C16—H16A0.9700
C2—C111.370 (2)C16—H16B0.9700
C2—C31.432 (2)C17—C181.501 (3)
C3—C41.409 (3)C17—H17A0.9700
C3—C81.414 (3)C17—H17B0.9700
C4—C51.367 (3)C18—N11.462 (3)
C4—H40.9300C18—H18A0.9700
C5—C61.391 (3)C18—H18B0.9700
C5—H50.9300C19—C201.383 (2)
C6—C71.355 (3)C19—C241.384 (3)
C6—H60.9300C20—C211.380 (2)
C7—C81.410 (3)C20—H200.9300
C7—H70.9300C21—C221.365 (3)
C8—C91.415 (3)C21—H210.9300
C9—C101.344 (3)C22—O41.366 (2)
C9—H90.9300C22—C231.375 (3)
C10—C111.405 (3)C23—C241.369 (3)
C10—H100.9300C23—H230.9300
C11—O11.368 (2)C24—H240.9300
C12—O11.426 (2)C25—O41.415 (3)
C12—C131.513 (2)C25—H25A0.9600
C12—H12A0.9700C25—H25B0.9600
C12—H12B0.9700C25—H25C0.9600
C13—C261.518 (3)C26—O31.187 (2)
C13—C141.550 (2)C26—O21.328 (2)
C14—C191.511 (2)C27—O21.447 (3)
C14—C151.540 (3)C27—H27A0.9600
C14—H140.9800C27—H27B0.9600
C15—N11.482 (2)C27—H27C0.9600
N1—C1—C2116.27 (15)C14—C15—H15107.5
N1—C1—C13106.30 (14)C17—C16—C15102.37 (17)
C2—C1—C13111.88 (14)C17—C16—H16A111.3
N1—C1—H1107.3C15—C16—H16A111.3
C2—C1—H1107.3C17—C16—H16B111.3
C13—C1—H1107.3C15—C16—H16B111.3
C11—C2—C3118.40 (16)H16A—C16—H16B109.2
C11—C2—C1120.71 (15)C18—C17—C16102.44 (18)
C3—C2—C1120.79 (15)C18—C17—H17A111.3
C4—C3—C8118.32 (17)C16—C17—H17A111.3
C4—C3—C2122.10 (17)C18—C17—H17B111.3
C8—C3—C2119.58 (17)C16—C17—H17B111.3
C5—C4—C3120.65 (19)H17A—C17—H17B109.2
C5—C4—H4119.7N1—C18—C17104.1 (2)
C3—C4—H4119.7N1—C18—H18A110.9
C4—C5—C6120.9 (2)C17—C18—H18A110.9
C4—C5—H5119.6N1—C18—H18B110.9
C6—C5—H5119.6C17—C18—H18B110.9
C7—C6—C5119.9 (2)H18A—C18—H18B109.0
C7—C6—H6120.1C20—C19—C24116.18 (17)
C5—C6—H6120.1C20—C19—C14125.22 (16)
C6—C7—C8121.1 (2)C24—C19—C14118.60 (15)
C6—C7—H7119.4C21—C20—C19121.92 (18)
C8—C7—H7119.4C21—C20—H20119.0
C7—C8—C3119.12 (19)C19—C20—H20119.0
C7—C8—C9122.01 (19)C22—C21—C20120.22 (18)
C3—C8—C9118.83 (17)C22—C21—H21119.9
C10—C9—C8121.16 (18)C20—C21—H21119.9
C10—C9—H9119.4C21—C22—O4124.41 (19)
C8—C9—H9119.4C21—C22—C23119.14 (18)
C9—C10—C11120.08 (18)O4—C22—C23116.45 (19)
C9—C10—H10120.0C24—C23—C22119.95 (19)
C11—C10—H10120.0C24—C23—H23120.0
O1—C11—C2123.82 (16)C22—C23—H23120.0
O1—C11—C10114.28 (15)C23—C24—C19122.43 (18)
C2—C11—C10121.87 (17)C23—C24—H24118.8
O1—C12—C13112.03 (14)C19—C24—H24118.8
O1—C12—H12A109.2O4—C25—H25A109.5
C13—C12—H12A109.2O4—C25—H25B109.5
O1—C12—H12B109.2H25A—C25—H25B109.5
C13—C12—H12B109.2O4—C25—H25C109.5
H12A—C12—H12B107.9H25A—C25—H25C109.5
C12—C13—C26108.88 (15)H25B—C25—H25C109.5
C12—C13—C1109.10 (14)O3—C26—O2122.82 (18)
C26—C13—C1114.22 (14)O3—C26—C13124.82 (17)
C12—C13—C14113.80 (14)O2—C26—C13112.33 (16)
C26—C13—C14109.63 (14)O2—C27—H27A109.5
C1—C13—C14101.16 (13)O2—C27—H27B109.5
C19—C14—C15118.94 (15)H27A—C27—H27B109.5
C19—C14—C13118.49 (14)O2—C27—H27C109.5
C15—C14—C13104.79 (14)H27A—C27—H27C109.5
C19—C14—H14104.3H27B—C27—H27C109.5
C15—C14—H14104.3C18—N1—C1119.67 (16)
C13—C14—H14104.3C18—N1—C15108.60 (15)
N1—C15—C16105.10 (16)C1—N1—C15109.70 (14)
N1—C15—C14105.46 (14)C11—O1—C12116.10 (13)
C16—C15—C14122.97 (16)C26—O2—C27116.63 (18)
N1—C15—H15107.5C22—O4—C25117.36 (18)
C16—C15—H15107.5
N1—C1—C2—C11111.83 (18)C13—C14—C15—N124.27 (17)
C13—C1—C2—C11−10.5 (2)C19—C14—C15—C1639.4 (3)
N1—C1—C2—C3−72.0 (2)C13—C14—C15—C16−95.8 (2)
C13—C1—C2—C3165.67 (14)N1—C15—C16—C1728.2 (2)
C11—C2—C3—C4179.67 (17)C14—C15—C16—C17148.5 (2)
C1—C2—C3—C43.4 (3)C15—C16—C17—C18−40.8 (2)
C11—C2—C3—C80.1 (2)C16—C17—C18—N138.3 (3)
C1—C2—C3—C8−176.21 (16)C15—C14—C19—C20−58.3 (2)
C8—C3—C4—C50.8 (3)C13—C14—C19—C2070.9 (2)
C2—C3—C4—C5−178.80 (17)C15—C14—C19—C24121.98 (19)
C3—C4—C5—C6−1.2 (3)C13—C14—C19—C24−108.8 (2)
C4—C5—C6—C70.6 (3)C24—C19—C20—C21−3.1 (3)
C5—C6—C7—C80.5 (3)C14—C19—C20—C21177.25 (18)
C6—C7—C8—C3−0.9 (3)C19—C20—C21—C220.7 (3)
C6—C7—C8—C9177.03 (19)C20—C21—C22—O4−177.28 (18)
C4—C3—C8—C70.2 (3)C20—C21—C22—C232.8 (3)
C2—C3—C8—C7179.84 (16)C21—C22—C23—C24−3.8 (3)
C4—C3—C8—C9−177.72 (17)O4—C22—C23—C24176.24 (19)
C2—C3—C8—C91.9 (2)C22—C23—C24—C191.4 (3)
C7—C8—C9—C10−179.41 (18)C20—C19—C24—C232.0 (3)
C3—C8—C9—C10−1.5 (3)C14—C19—C24—C23−178.29 (18)
C8—C9—C10—C11−0.9 (3)C12—C13—C26—O322.6 (3)
C3—C2—C11—O1179.38 (15)C1—C13—C26—O3144.8 (2)
C1—C2—C11—O1−4.3 (3)C14—C13—C26—O3−102.5 (2)
C3—C2—C11—C10−2.5 (3)C12—C13—C26—O2−159.46 (15)
C1—C2—C11—C10173.79 (16)C1—C13—C26—O2−37.2 (2)
C9—C10—C11—O1−178.78 (16)C14—C13—C26—O275.45 (18)
C9—C10—C11—C23.0 (3)C17—C18—N1—C1−147.84 (18)
O1—C12—C13—C2665.72 (19)C17—C18—N1—C15−20.9 (2)
O1—C12—C13—C1−59.54 (19)C2—C1—N1—C18−17.6 (2)
O1—C12—C13—C14−171.67 (14)C13—C1—N1—C18107.66 (18)
N1—C1—C13—C12−87.59 (17)C2—C1—N1—C15−144.03 (15)
C2—C1—C13—C1240.32 (19)C13—C1—N1—C15−18.77 (18)
N1—C1—C13—C26150.32 (15)C16—C15—N1—C18−4.7 (2)
C2—C1—C13—C26−81.77 (18)C14—C15—N1—C18−136.01 (17)
N1—C1—C13—C1432.66 (17)C16—C15—N1—C1127.72 (16)
C2—C1—C13—C14160.56 (14)C14—C15—N1—C1−3.54 (19)
C12—C13—C14—C19−53.0 (2)C2—C11—O1—C12−14.2 (2)
C26—C13—C14—C1969.19 (19)C10—C11—O1—C12167.62 (15)
C1—C13—C14—C19−169.85 (14)C13—C12—O1—C1146.8 (2)
C12—C13—C14—C1582.45 (17)O3—C26—O2—C271.0 (3)
C26—C13—C14—C15−155.35 (14)C13—C26—O2—C27−176.96 (17)
C1—C13—C14—C15−34.40 (16)C21—C22—O4—C255.7 (3)
C19—C14—C15—N1159.48 (15)C23—C22—O4—C25−174.4 (2)
D—H···AD—HH···AD···AD—H···A
C1—H1···O20.982.322.792 (2)108
C23—H23···Cg1i0.932.923.633 (3)135
C25—H25C···Cg2ii0.962.903.715 (3)143
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
C1—H1⋯O20.982.322.792 (2)108
C23—H23⋯Cg1i0.932.923.633 (3)135
C25—H25CCg2ii0.962.903.715 (3)143

Symmetry codes: (i) ; (ii) . Cg1 is the centroid of the C3–C8 ring and Cg2 is the centroid of the C19–C24 ring.

  6 in total

1.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

Review 2.  Semisynthetic derivatives of pyrrolizidine alkaloids of pharmacodynamic importance: a review.

Authors:  C K Atal
Journal:  Lloydia       Date:  1978 Jul-Aug

3.  An empirical correction for absorption anisotropy.

Authors:  R H Blessing
Journal:  Acta Crystallogr A       Date:  1995-01-01       Impact factor: 2.290

Review 4.  DNA minor groove alkylating agents.

Authors:  W A Denny
Journal:  Curr Med Chem       Date:  2001-04       Impact factor: 4.530

5.  Synthesis, antimicrobial and antifungal activity of a new class of spiro pyrrolidines.

Authors:  A Amal Raj; R Raghunathan; M R SrideviKumari; N Raman
Journal:  Bioorg Med Chem       Date:  2003-02-06       Impact factor: 3.641

6.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  6 in total
  3 in total

1.  Methyl 4-(4-chloro-phen-yl)-1,2,3,3a,4,4a,5,12c-octa-hydro-benzo[f]chromeno[3,4-b]pyrrolizine-4a-carboxyl-ate.

Authors:  B Gunasekaran; S Kathiravan; R Raghunathan; V Manivannan
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-03-13

2.  Methyl 4-phenyl-1,2,3,3a,4,4a,5,12c-octa-hydronaphtho[1',2':3,2]furo[5,4-b]pyrrolizine-4a-carboxyl-ate.

Authors:  S Selvanayagam; B Sridhar; K Ravikumar; S Kathiravan; R Raghunathan
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-05-15

3.  Methyl 4-(4-chloro-phen-yl)-3,3a,4,4a,5,12c-hexa-hydro-2-thia-naphtho-[1',2':3,2]furo[5,4-b]pyrrolizine-4a-carboxyl-ate.

Authors:  S Selvanayagam; B Sridhar; K Ravikumar; S Kathiravan; R Raghunathan
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-07-24
  3 in total

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