反应详情

A solution of (3aR,6aS)-2-benzyl-1,3,3a,4,5,6a-hexahydrocyclopenta[c]pyrrol-6-one (19.8 g, 92 mmol) in dichloromethane (770 mL) was treated with benzyl chloroformate (26.7 g, 22.3 mL, 156 mmol) at room temperature. The reaction mixture was stirred overnight at room temperature. The solvent was removed under reduced pressure and the crude material obtained was purified using silica gel column chromatography using 40 to 99% EtOAc in hexanes to obtain benzyl(3aR,6aS)-6-oxo-1,3,3a,4,5,6a-hexahydrocyclopenta[c]pyrrole-2-carboxylate (11.2 g, 43.19 mmol, 47%) as a light yellow oil. NMR (400 MHz, CDCl3) δ 7.41-7.23 (m, 5H), 5.11 (d, J=4.2 Hz, 2H), 3.82-3.52 (m, 3H), 3.29-3.14 (m, J=5.6 Hz, 1H), 3.13-2.93 (m, J=11.1, 6.8 Hz, 1H), 2.81-2.68 (m, J=8.6, 3.6 Hz, 1H), 2.37 (t, J=7.8 Hz, 2H), 2.26-2.10 (m, 1H), 1.86 (s, 1H). LC/MS m/z 260.1 [M+H]+.

1. customThe solvent was removed under reduced pressure
2. customthe crude material obtained
3. customwas purified