反应详情

温度

0 °C

A solution of tert-butyl 3-fluoro-4-oxopiperidine-1-carboxylate, 2.3 (80 g, 0.368 mol) in THF (800 mL) was treated with L-Selectride (405 mL, 0.405 mol, drop wise) at −78° C. under nitrogen atmosphere. The resulting reaction mixture was stirred for 30 min. at the same temperature, MeOH (45.1 mL, 1.105 mol) 1M NaOH (1104 mL, 1.105 mol) were added and the reaction was allowed to warm to 0° C. The reaction was quenched by drop wise addition of H2O2 (125.1 mL, 1.843 mol). The volatiles were removed under vacuume and diluted with water (500 mL) and methylene chloride (500 mL). After separation, the organic layer was washed brine, dried over Na2SO4 and concentrated in vacuum to provide the desired product tert-butyl 3-fluoro-4-hydroxypiperidine-1-carboxylate, 2.4 (63 g, 78%). 1HNMR (CDCl3, 400 MHz): δ 4.70-4.65 (m, 0.5H), 4.58-4.52 (m, 0.5H), 3.99-3.84 (m, 2H), 3.82-3.58 (m, 1H), 3.55-3.27 (m, 1H), 3.18 (brs, 1H), 2.06 (brs, 1H), 1.89-1.70 (m, 2H), 1.47 (s, 9H).

1. customThe resulting reaction mixture
2. additionwere added
3. customThe volatiles were removed under vacuume
4. additiondiluted with water (500 mL) and methylene chloride (500 mL)
5. customAfter separation
6. washthe organic layer was washed brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated in vacuum