the preparation of enantiomerically pure 1-aminocycloalkene-1-carboxylic acids is reported using a chelate Claisen rearrangement–metathesis sequence. Enantioselectivity is achieved through substrate control and a highly ordered transition state, without the use of a chiral auxiliary. A synthesis of 1-aminocyclopent-3-ene-1-carboxylic acid 1 in five steps and 47% overall yield is also described.
据报道,使用螯合的克莱森重排-复分解序列可以有效地制备对映体纯的1-
氨基环烯-1-
羧酸。对映选择性是通过底物控制和高度有序的过渡态实现的,无需使用手性助剂。还描述了通过五个步骤合成1-
氨基环戊-3-烯-1-
羧酸1并且总产率为47%的方法。