反应详情

To a solution of 3-bromo-4-methylbenzaldehyde oxime (0.85 g, 4 mmol, 1.0 eq) in THF (50 mL) was added pyridine (0.2 mL, 2.4 mmol, 0.6 eq) followed by N-chlorosuccinimide (530 mg, 4 mmol, 1.0 eq) and the resulting mixture was refluxed for 1 h. The reaction was cooled to room temperature before the addition of a solution of methylenecyclopentane (0.42 mL, 4 mmol, 1.0 eq) in THF (5 mL) followed by triethyl amine (0.94 mL, 7 mmol, 1.7 eq). The resulting solution was refluxed for 1 h. The solvent was evaporated under vacuum and usual work up afforded 690 mg of the title product as a white solid. 1HNMR (400 MHz, CDCl3) δ 8.09 (s, 1H), 7.52 (d, J=8.0 Hz, 1H), 7.24 (d, J=8.0 Hz, 1H), 3.22 (s, 2H), 2.41 (s, 3H), 2.14-2.11 (m, 2H), 1.88-1.84 (m, 2H), 1.77-1.72 (m, 4H); ESI-MS (m/z) 294, 296 [(MH)+, Br79,81].

1. temperaturethe resulting mixture was refluxed for 1 h
2. temperatureThe resulting solution was refluxed for 1 h
3. customThe solvent was evaporated under vacuum and usual work