3-Acetylamino-7-chloro-2-[(N-methoxy-N-methylamino)carbonyl]indole → 3-Acetylamino-2-benzoyl-7-chloroindole

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-acetylamino-7-chloro-2-[(N-methoxy-N-methylamino)carbonyl]indole (step 4, 321 mg, 1.08 mmol) in diethyl ether-tetrahydrofuran (1:1, 10 ml) was added phenyl lithium (1M solution in cyclohexane, 5.4 ml, 5.42 mmol) at −78° C. After stirring for 1 h, the mixture was allowed to warm to 0° C. and stirred for an additional 2 h. The mixture was quenched with saturated aqueous ammonium chloride (20 ml) and extracted with ether (150 ml). The organic layer was washed with water (50 ml) and dried (MgSO4). Removal of solvent gave an oily residue. Purification by flash column chromatography eluting with ethyl acetate/hexane (1:3) afforded yellow crystals. Recrystallization from ethyl acetate gave 87 mg, (26%) of the title compound. m.p.: 185-188° C. IR (KBr) ν: 3240, 1690, 1628, 1543, 1375, 1315, 1250, 725 cm1 1H-NMR (CDCl3) δ: 9.77 (1 H, br s), 8.36 (1 H, br s), 8.18 (1 H, d, J=8.6 Hz), 7.87-7.83 (2 H, m), 7.71-7.57 (3 H, m), 7.40 (1 H, dd, J=1.0, 7.6 Hz), 7.10 (1 H, dd, J=7.6, 8.4 Hz), 2.26 (3 H, s).

Provenance & Evidence