反应详情

To a suspension of lithium aluminum hydride (911 mg, 24.0 mmol, 1.4 eq.) in anhydrous diethyl ether (75 mL, 0.23 M) at 0° C. was slowly added, drop-wise over 15 minutes, a solution of #61 (2.25 g, 17.2 mmol, 1 eq.) in diethyl ether (15 mL). The reaction was warmed to room temperature. After 5 hours, the reaction was cooled to 0° C. and quenched by addition of water (1 mL), then filtered through a small pad of Celite and washed with methanol. The filtrate was dried over sodium sulfate, filtered, and concentrated in vacuo to provide #62 (1.683 g, 73%) as a golden oil. LC-MS: m/z 136.1 [M+H+], retention time=0.23 minutes; 1H NMR (400 MHz, CDCl3) δ 6.64-6.67 (m, 2H), 6.16-6.21 (m, 2H), 5.16-5.21 (m, 2H), 2.84-2.89 (m, 2H), 1.86-1.92 (m, 2H), 1.62-1.70 (m, 1H).

1. additionwas slowly added
2. waitAfter 5 hours
3. temperaturethe reaction was cooled to 0° C.
4. customquenched by addition of water (1 mL)
5. filtrationfiltered through a small pad of Celite
6. washwashed with methanol
7. dry with materialThe filtrate was dried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated in vacuo