Sulfuric Acid → 1-(chloromethyl)-5-nitro-1,2-dihydro-3H-benzo[e]indole-7 carboxamide

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Reaction Steps

A solution of 144 (100 mg, 0.35 mmol) in a mixture of cone. H2SO4 (1.8 mL) and water (0.2 mL) was heated at 65° C. for 1 h, then cooled and neutralized with saturated aqueous KHCO3. The precipitate was collected, washed with water, and dissolved in warm EtOAc. The solution was filtered through a column on silica gel and then concentrated and diluted with iPr2O to give 1-(chloromethyl)-5-nitro-1,2-dihydro-3H-benzo[e]indole-7 carboxamide (145) (92 mg, 86%) as a red solid: mp (EtOAc/iPr2O)>300° C.; 1H NMR [(CD3)2SO] δ 8.61 (d, J=1.3 Hz, 1H), 8.09, 7.39 (2 br s, 2H), 7.95 (dd, J=8.8, 1.7 Hz, 1H), 7.89 (d, J=8.7 Hz, 1H), 7.66 (s, 1H), 6.54 (s, 1H), 426-4.18 (m, 1H), 3.91 (dd, J=11.0, 3.8 Hz, 1H), 3.86 (td, J=9.9, 2.3 Hz, 1H), 3.78 (dd, J=11.0, 8.5 Hz, 1H), 3.72 (dd, J=10.3, 2.6 Hz, 1H). Anal. (C14H12ClN3O3) C, H, N.

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