反应详情

(Synthesis 1991, 894-896.) 3-Aminocrotonitrile (29, 2.9 g, 36 mmol) and ethyl propiolate (30, 3.0 mL, 36 mmol) were dissolved in dry DMF (17 mL). The reaction mixture was stirred for 1 h at room temperature, and the mixture was heated at reflux for 3 d. The precipitate formed after cooling to room temperature was collected, washed with methanol (5 mL), ether (10 mL), and dried to yield 131 (1.5 g, 31%): mp>300° C. 1H NMR (300 MHz, DMSO-d6) δ 12.43 (s, 1H), 7.58 (d, J=9.6 Hz, 1H), 6.23 (d, J=9.6 Hz, 1H), 2.37 (s, 3H).

1. temperaturethe mixture was heated
2. temperatureat reflux for 3 d
3. customThe precipitate formed
4. temperatureafter cooling to room temperature
5. customwas collected
6. washwashed with methanol (5 mL), ether (10 mL)
7. customdried