反应详情

温度

45 °C

365.0 mg of methyl (S)-2-[(6-azaspiro[2.5]octane-6-carbonyl)amino]-4,4-difluoropentanoate (1.2 mmol) were dissolved in a mixture of 10.8 ml of THF and 3.6 ml of methanol. 3.6 ml of an aqueous 1 M LiOH solution (3 eq.) were added to this solution. The mixture was stirred at 45° C. (bath temperature) for one hour and then 3.6 ml of 1 M HCl solution were added. The mixture was concentrated under reduced pressure and codistilled with DMF twice more. The (S)-2-[(6-azaspiro[2.5]octane-6-carbonyl)amino]-4,4-difluoropentanoic acid thus obtained was clean enough for the next reaction. Yield: 400 mg (quant.)

1. concentrationThe mixture was concentrated under reduced pressure