Cesium carbonate → tert-butyl (1-{[2-amino-3-(aminocarbonyl)-9H-pyrido[2,3-b]indol-9-yl]methyl}cyclopropyl)carbamate

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To a stirred solution of 2-amino-9H-pyrido[2,3-b]indole-3-carboxamide (5, 318 mg, 1.41 mmol) in N,N-dimethylformamide (17 mL) was added powdered cesium carbonate (2.29 g, 7.03 mmol), tert-butyl[1-(iodomethyl)cyclopropyl]carbamate (2.26 g, 7.61 mmol, prepared from the corresponding alcohol (J. Med. Chem. 1988, 31, 1694-7) following the procedure detailed in the preparation of xxvii below) was added. The mixture was heated at 100° C. under nitrogen for 2 h. The reaction was cooled to room temperature, diluted with ethyl acetate (150 mL) and washed thrice with water and twice with brine. The extracts were dried over magnesium sulfate, filtered and concentrated. The crude product was purified by silica gel chromatography (95/5 methylene chloride/methanol to 93/7 methylene chloride/methanol gradient) to afford the titled product (63, 75 mg, 13%). NH4OAc Standard conditions. DAD Retention time =7.29 min. M+H=396; 1H NMR (300 MHz, DMSO-d6): δ 8.72 (s, 1H), 7.79 (d, J=7.3 Hz, 1H), 7.54-7.41 (m, 2H), 7.26 (dd, J=7.3 Hz, 1H), 7.20-7.11 (m, 2H), 4.34 (s, 2H), 1.35 (s, 9H), 1.18-1.05 (m, 2H), 0.65-0.54 (m, 2H).

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