反应详情

To a cold solution of N-(3-amino-4-chlorobenzyl)cyclopropanecarboxamide (2.00 g, 8.90 mmol) in conc. HCl (25 mL) was added aqueous solution of sodium nitrite (0.676 g, 9.7 mmol) at −20° C. to −25° C. The reaction mass was stirred at −20° C. to −25° C. for 30 min, followed by addition of stannous chloride solution (5.0 g, 22.2 mmol) in conc. HCl slowly. The reaction mass was stirred at −20° C. to −25° C. for 1 h. The reaction mass was basified with aqueous NaOH at below 0° C. The reaction mass was diluted with water, extracted with 10% MeOH:DCM and concentrated to afford 1.6 g of desired product. 1H NMR (300 MHz, DMSO d6): δ 0.66 (m, 4H), 1.58 (m, 1H), 4.10 (s, 2H), 4.18 (d, J=5.4 Hz, 2H), 6.47 (m, 2H), 7.11 (m, 2H), 8.51 (br s, 1H); MS (m/z): 240.05 (M+FI)+.

1. stirringThe reaction mass was stirred at −20° C. to −25° C. for 1 h
2. extractionextracted with 10% MeOH
3. concentrationDCM and concentrated