Acetic Acid → 1-(chloromethyl)-7-nitro-1,2-dihydro-3H-benzo[e]indole

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Reaction Steps

A solution of 131 (1.00 g, 2.79 mmol) in dioxane (30 mL) was treated with a solution of Cs2CO3 (3.26 g, 10 mmol) in water (3 mL) and MeOH (17 mL), and the mixture was stirred vigorously at room temperature for 15 min. The resulting solution was treated with AcOH (1.2 mL), then concentrated to a small volume under reduced pressure and partitioned between water and CH2Cl2. The organic phase was washed with water (×2), dried, and filtered through a column of silica gel. Evaporation and trituration with petroleum ether/iPr2O gave 1-(chloromethyl)-7-nitro-1,2-dihydro-3H-benzo[e]indole (134) (702 mg, 96%) as an orange-red solid: mp (CH2Cl2/petroleum ether) 121-122° C.; 1H NMR [(CD3)2SO] δ 8.76 (d, J=2.2 Hz, 1H), 8.05 (dd, J=9.3, 2.3 Hz, 1H), 7.97 (d, J=8.7 Hz, 1H), 7.76 (d, J=9.3 Hz, 1H), 7.09 (d, J=8.7 Hz, 1H), 6.79 (s, 1H), 4.17-4.04 (m, 1H), 3.95-3.78 (m, 2H, 3.76-3.63 (m, 2H). Anal. (C13H11ClN2O2) C, H, N.

Provenance & Evidence