反应详情

A reaction flask was charged with 4-hydroxypiperidine-1-carboxylic acid t-butyl ester (10.05 g, 49.9 mmol) in dry DMF (50 mL) under Argon. NaH (60% in oil, 2.0 g, 50.0 mmol) was added in portions and the mixture was stirred at 50° for 1 h. The mixture was cooled to rt and bromomethylcyclopropane (6.752 g, 50.0 mmol) was added followed by stirring at rt for 20 h under Argon. The reaction mixture was quenched with water and the product extracted into EtOAc. The combined organic phases were dried over Na2SO4, filtered, and concentrated. The product was purified by flash column chromatography (SiO2; n-heptane/EtOAc 2:1) to give the title compound (6.809 g, 53%). 1H NMR (CDCl3) δ 3.66-3.58 (m, 2H), 3.31-3.24 (m, 1H), 3.12 (d, 2H), 2.90-2.83 (m, 2H), 1.68-1.60 (m, 2), 1.38-1.30 (m, 2H), 1.28 (s, 9H), 0.91-0.82 (m, 1H), 0.38-0.33 (m, 2H), 0.04-0.00 (m, 2H); 13C NMR (CDCl3) δ 154.8, 79.3, 74.4, 72.6, 41.4, 31.2, 28.4, 10.9, 3.0

1. stirringby stirring at rt for 20 h under Argon
2. customThe reaction mixture was quenched with water
3. extractionthe product extracted into EtOAc
4. dry with materialThe combined organic phases were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe product was purified by flash column chromatography (SiO2; n-heptane/EtOAc 2:1)