反应详情

To a solution of 77E (800 mg, 2.3 mmol) in DCM (15 mL) was added 4-methylmorpholine N-oxide (541 mg, 4.6 mmol, 2 equiv) followed by the addition of TPAP (177 mg, 0.5 mmol, 0.22 equiv). The mixture was stirred at rt for 3 h. The mixture was diluted with hexane (10 mL), loaded on a layer of silica gel and eluted with 25% EtOAc/hexane. The filtrate was concentrated to gave the desired product 77F (711 mg, 90%): Rf (30% EtOAc/hexane) 0.87; HPLC (Phenomenex Luna 5 u C18 4.6×50 mm, linear gradient over 4 min) retention time 4.1 min (100%); MS (ES) m/z 344.1 [M+1]+; HRMS calcd for C17H34NO4Si 344.2257, Found 344.2259.

1. washeluted with 25% EtOAc/hexane
2. concentrationThe filtrate was concentrated