Cesium carbonate → 3-(4-Fluoro-benzenesulfonyl)-1-trityloxy-azepan-2-one

Participants

Reaction Steps

N-(4-Bromo-butyl)-2-(4-fluoro-benzenesulfonyl)-N-trityloxy-acetamide prepared from step E (170.2 mg, 0.279 mmol) and Cs2CO3 (187.3 mg, 0.575 mmol) in anhydrous DMF (6 mL) was stirred at room temperature for overnight.). The reaction mixture was diluted with EtOAc and washed sequentially with water and saturated NaCl solution. The organic phase was then dried over anhydrous Na2SO4 and concentrated under reduced pressure to gave a crude material, which was then purified by a column chromatography (0˜30% EtOAc in hexane). MS: 552.2 (M+Na)+.

Provenance & Evidence