反应详情

温度

60 °C

Cs2CO3 (8.42 g, 25.8 mmol) was added to a solution of 1-tert-butyl 2-methyl (2S,4S)-4-{[(4-bromophenyl)sulfonyl]oxy}pyrrolidine-1,2-dicarboxylate (4 g, 8.61 mmol) and the product from step 1 (3.49 g, 12.92 mmol) in NMP (86 ml) under nitrogen. The mixture was then heated to 60° C. After 6.5 h, the reaction was extracted with water and EtOAc. The organic layer was extracted with water and brine and dried over MgSO4. The solvent was then removed in vacuo. The crude product (6.5 g) was purified on silica (gradient elution, 0-100% EtOAc/hexanes, and then 0-5% MeOH/DCM) to yield 2.26 g (53%) of the title compound. LRMS ESI+ ((M-Boc)+H)+ 397.3/399.3.

1. extractionthe reaction was extracted with water and EtOAc
2. extractionThe organic layer was extracted with water and brine
3. dry with materialdried over MgSO4
4. customThe solvent was then removed in vacuo
5. customThe crude product (6.5 g) was purified on silica (
6. washgradient elution, 0-100% EtOAc/hexanes