反应详情

A solution of (R)-3-((2S,3S,E)-2-allyl-3-hydroxy-5-phenylpent-4-enoyl)-4-benzyloxazolidin-2-one (50 g, 128 mmol) and Grubbs 2nd generation catalyst (5.4 g, 6.4 mmol) in toluene (300 mL) was degassed with nitrogen three times, and stirred at room temperature overnight. The reaction mixture was then concentrated to dryness under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate:petroleum ether=1:4) to afford the title compound (32 g, 87%) as a dark brown oil, which solidified upon standing. MS (ES+) C17H19NO3 requires: 285, found: 270 [M+H−H2O]+.

1. concentrationThe reaction mixture was then concentrated to dryness under reduced pressure
2. customthe residue was purified by silica gel column chromatography (ethyl acetate:petroleum ether=1:4)