反应详情

To a magnetically stirred solution of (R)-2-(tetrahydro-2H-pyran-3-yl)acetaldehyde (11 g, 85.8 mmol) in Et2O (215 mL) at room temperature was added MeNH2 (2M in THF, 215 mL, 429.2 mmol) and molecular sieves (4 Å, powdered, activated, 21.5 g). The reaction was stirred at room temperature for 1 h. The resulting mixture was then filtered and concentrated under reduced pressure to furnish (R,E)-N-(2-(tetrahydro-2H-pyran-3-yl)ethylidene)methanamine as a yellow oil (11.3 g, 80 mmol, 93%). The crude material was carried on without further purification. 1H NMR (400 MHz, CDCl3) δ 7.67 (m, 1H), 3.86-3.91 (m, 2H), 3.36-3.43 (m, 1H), 3.29 (s, 3H), 3.13 (dd, J=11.0, 9.8 Hz, 1H), 1.95-2.14 (m, 2H), 1.86-1.91 (m, 2H), 1.62-1.68 (m, 2H), 1.21-1.30 (m, 1H).

1. filtrationThe resulting mixture was then filtered
2. concentrationconcentrated under reduced pressure