Acetyl chloride → 7-Acetyl-1-(chloromethyl)-3-(trifluoroacetyl)-1,2-dihydro-3h-benzo[e]indole

Participants

Reaction Steps

Acylation of 108 (0.88 g, 2.8 mmol) with AlC3 and AcCl in PhNO2 at 0° C., stirring at room temperature for 16 h, and workup as above, gave a crude product. Chromatography on silica gel, eluting with EtOAc/petroleum ether (from 0:1 to 1:3) gave 7-acetyl-1-(chloromethyl)-3-(trifluoroacetyl)-1,2-dihydro-3H-benzo[e]indole (110) (196 mg, 33% based on consumption of starting material): mp (EtOAc/petroleum ether) 168-170° C.; 1H NMR (CDCl3) δ 8.52 (d, J=8.9 Hz, 1H), 8.51 (s, 1H), 8.14 (dd, J=8.8, 1.7 Hz, 1H), 8.02 (d, J=9.0 Hz, 1H), 7.84 (d, J=8.8H, 1H), 4.68-4.62 (m, 1H), 4.49-4.41 (m, 1H), 4.28-4.19 (m, 1H), −3.99-3.93 (m, 1H), 3.61-3.55 (m, 1H), 2.74 (s, 3H); 13C NMR δ 197.6, 182.8, 154.9 (q, JC-F 38.4 Hz), 142.1, 134.1, 132.2, 131.3, 131.1, 125.7, 125.5, 131.1, 118.1, 116.0 (q, JC-F 288 Hz), 52.7, 45.4, 42.6, 26.6. Anal. (C17H13ClF3NO2) C, H, N. Further elution gave recovered 108 (360 mg, 40%).

Provenance & Evidence