Starting from D-(+)-galactose, the crystalline spirooxazolidin-2-one 2 can be readily prepared in an optically pure state by a nitrene-mediated four-step sequence, and serves to control both aldol and Diels–Alder reactions with high chiral efficiency, being easy to remove after use.
从D-(+)-半
乳糖出发,通过亚氮中间体介导的四步反应序列,可以方便地制备手性纯的结晶螺
恶唑啉酮2,它在使用后易于去除,并且能够高效地控制醛醇反应和狄尔斯-阿尔德反应。