Maleic Anhydride → 4-(2-Chlorophenyl)-9-methoxy-4,5,6,10c-tetrahydro-1H-furo[3,4-c]carbazole-1,3(3aH)-dione

HRID 11127

Reaction equation

HRID 11127 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH:8]=[CH:9][C:10]1[NH:11][C:12]2[C:17]([CH:18]=1)=[CH:16][C:15]([O:19][CH3:20])=[CH:14][CH:13]=2.[C:21]1(=[O:27])[O:26][C:24](=[O:25])[CH:23]=[CH:22]1>C1(C)C(C)=CC=CC=1>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH:8]1[CH:23]2[C:24](=[O:25])[O:26][C:21](=[O:27])[CH:22]2[C:18]2[C:17]3[CH:16]=[C:15]([O:19][CH3:20])[CH:14]=[CH:13][C:12]=3[NH:11][C:10]=2[CH2:9]1

Participants

4

Reactant 2

HCID 7923Maleic AnhydrideHCID 695838012-[2-(2-Chlorophenyl)ethenyl]-5-methoxy-1H-indole

Product 1

HCID 118435504-(2-Chlorophenyl)-9-methoxy-4,5,6,10c-tetrahydro-1H-furo[3,4-c]carbazole-1,3(3aH)-dione

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

A solution of trans-diene (27) (0.30 g, 1.06 mmol) prepared as described in example 37 and maleic anhydride (0.16 g, 1.59 mmol) in xylene (30 mL) were heated at reflux for 18 hours, before being concentrated in vacuo and chromatographed on silica eluting with ethyl acetatelhexane (1:2). Crystallisation from ethyl acetate/hexane then gave anhydride (286) (0.29 g, 72%) as a pale brown powder, mp 189–191° C. 1H NMR δ (CD3)2SO] 11.16 (br s, 1H), 7.69 (dd, J=7.7, 1.4 Hz, 1H), 7.51 (dd, J=7.7, 1.4 Hz, 1H), 7.43 (ddd, J=7.7, 7.7, 1.4 Hz, 1H), 7.36 (ddd, J=7.7, 7.7, 1.4 Hz, 1H), 7.25 (d, J=8.6 Hz, 1H), 7.15 (d, J=2.4 Hz, 1H), 6.77 (dd, J=8.6, 2.4 Hz, 1H), 4.70 (d, J=7.7 Hz, 1H), 4.47 (dd, J=7.7, 3.5 Hz, 1H), 3.78 (s, 3H), 3.71–3.66 (m, 1H), 3.36 (dd, J=15.9, 13.0 Hz, 1H), 2.99 (dd, J=15.9, 4.1 Hz, 1H). Found: C, 65.85; H, 3.95; N, 3.70. C21H16ClNO4 requires: C, 66.06; H, 4.22; N, 3.67.

Workup

  1. temperaturewere heated
  2. temperatureat reflux for 18 hours
  3. concentrationbefore being concentrated in vacuo
  4. customchromatographed on silica eluting with ethyl acetatelhexane (1:2)
  5. customCrystallisation from ethyl acetate/hexane

Sources & evidence

ORD record
ord-18531f62cf63405188edd0bdbe1ede32
Source dataset
uspto-grants-2006_08
Patent number
US07094798B1

Linked notes

Loading…