[CH2:1]([C:3]1[C:11]2[N:6]3[C:7](=[CH:12][CH:13]=[C:5]3[C:4]=1[C:14]1[CH:19]=[CH:18][C:17]([O:20]C)=[CH:16][CH:15]=1)[CH:8]=[CH:9][CH:10]=2)[CH3:2].[Cl-].[Al+3].[Cl-].[Cl-].C(S)C.Cl>ClCCl.C1(C)C=CC=CC=1.C(OCC)(=O)C.C(OCC)(=O)C.O.O1CCCC1>[CH2:1]([C:3]1[C:11]2[N:6]3[C:7](=[CH:12][CH:13]=[C:5]3[C:4]=1[C:14]1[CH:19]=[CH:18][C:17]([OH:20])=[CH:16][CH:15]=1)[CH:8]=[CH:9][CH:10]=2)[CH3:2]A solution of 1-ethyl-2-(4-methoxyphenyl)pyrrolo[2,1,5-cd]indolizine (Compound 34) (0.77 g, 2.79 mmol) in 25 ml of dry dichloromethane was stirred under a nitrogen atmosphere and aluminium chloride (2.23 g, 16.7 mmol) was added in portions. When the addition was complete, ethanethiol (1.25 ml, 16.7 mmol) was added, and stirring was continued for half an hour. The mixture was cooled in an ice bath followed by the addition of tetrahydrofuran (15 ml), 6M hydrochloric acid (3 ml), water (50 ml) and ethyl acetate (100 ml). The organic phase was separated and evaporated to leave a residue which was chromatograped over silica gel with toluene/ethyl acetate (4:1) as eluent. The proper fractions were collected and evaporated, and the residue was triturated with a mixture of ether (2 ml) and petroleum ether (5 ml) to afford 0.32 g (44%) of the title compound. M.p. 104-05° C. 1H-NMR (DMSO-d6, 200 MHz) δ: 1.41 (t, 3H), 3.22 (q, 2H), 6.98 (d, 2H), 7.29 (d, 1H), 7.67 (d, 2H), 7.69(d, 1H), 7.72(t, 1H), 8.05 (d, 1H), 8.10 (d, 1H), 9.68 (s, 1H). (Compound 52).
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