Ammonia → 1-(Chloromethyl)-3-{5-[2-(dimethylamino)ethoxy]indol-2-carbonyl}-5,7-dinitro-1,2-dihydro-3H-benzo[e]indole

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Reaction Steps

A mixture of amine 135 (100 mg, 0.33 mmol), 5-[2-(dimethylamino)ethoxy]indole-2-carboxylic acid hydrochloride (111 mg, 0.39 mmol), EDCI (249 mg, 1.30 mmol) and anhydrous TsOH (4.0 mg, 0.02 mmol) in dry DMA (8 mL) was stirred at room temperature under N2 for 6 h, then poured into dilute aqueous NH3. The basic mixture was stirred for 1 h, then the precipitate was collected and dissolved in EtOAc (300 mL) at room temperature. The solution was washed with water, dried, and then concentrated to 10 mL under reduced pressure below 30° C. to give crude 9. Treatment of a suspension of the free base in MeOH with HCl(g)/EtOAc, followed by crystallization from MeOH/Me2CO/EtOAc gave 9.HCl (114 mg, 60%) as a yellow solid: mp 263-264° C.; 1H NMR [(CD3)2SO] δ 11.88 (s, 1H), 10.15 (br s, 1H), 9.36 (s, 1H), 9.34 (d, J=2.2 Hz, 1H, 8.48 (d, J=9.3 Hz, 1H), 8.41 (dd, J=9.3, 2.2 Hz, 1H), 7.46 (d, J=8.9 Hz, 1H), 7.26 (s, 2H), 7.03 (dd, J=8.9, 2.3 Hz, 1H), 5.00 (t, J=10.5 Hz, 1H), 4.78-4.65 (m, 2H), 4.36 (t, J=4.9 Hz, 2H), 4.22-4.09 (m, 2H), 3.52 (t, J=4.5 Hz, 2H), 2.80 (s, 6H). Anal. (C26H24ClN5O6.HCl) C, H, N.

Provenance & Evidence