4-Bromo-2-chloro-1-isocyanatobenzene → N-(4-bromo-2-chlorophenyl)-2-{[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]acetyl}hydrazinecarboxamide

Participants

Reaction Steps

To a solution of 2-[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]acetohydrazide (700 mg, 3.31 mmol) in dry dichloromethane (15 mL) was added 4-bromo-2-chloro-1-isocyanatobenzene (770 mg, 3.31 mmol). The reaction was stirred overnight, diluted with hexane (15 mL), and the precipitate collected and washed with hexane to provide the title compound (1.3 g, 2.93 mmol, 88% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.85 (br. s, 1H), 8.82 (br. s, 1H), 8.50-8.23 (m, 1H), 8.05 (dd, J=5.3, 8.8 Hz, 1H), 7.72 (d, J=1.8 Hz, 1H), 7.49 (d, J=8.8 Hz, 1H), 3.81 (dd, J=7.6, 9.9 Hz, 0.5H), 3.77-3.39 (m, 2H), 3.31-3.13 (m, 1H), 2.94 (d, J=19.5 Hz, 0.5H), 2.64-2.54 (m, 0.5H), 2.47-2.39 (m, 0.5H), 2.28 (dd, J=7.3, 16.7 Hz, 2H), 2.17-1.88 (m, 1H), 1.80-1.47 (m, 2H), 0.81-0.61 (m, 4H).

Provenance & Evidence