反应详情

To a solution of (1R,3S)-1-benzyl 3-tert-butyl 2,2-dimethylcyclobutane-1,3-dicarboxylate (step 3, 1.0 g) dioxane-HCl (10 ml) was added at about 0° C. under nitrogen atmosphere. The reaction mixture was stirred for about 12 hours at room temperature. After completion of the reaction (monitored by TLC), the reaction mixture was diluted with ethyl acetate and washed with water. The organic layer was washed with brine, dried over Na2SO4 and concentrated under reduced pressure to give crude product, which upon column chromatography to afford the title compound (800 mg, 97.2% Yield). 1H NMR (300 MHz, CDCl3): δ 7.35 (5H, s), 5.12 (2H, d, J=2.7 Hz), 2.84 (2H, m), 2.63 (1H, m), 2.0 (1H, m), 1.35 (3H, s), 0.99 (3H, s); Mass: [M+H]+ 263.1 (20%), 285.1 [M+Na]+.

1. customAfter completion of the reaction (monitored by TLC)
2. washwashed with water
3. washThe organic layer was washed with brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated under reduced pressure
6. customto give crude product, which upon column chromatography