The aza-Claisen rearrangement of ketene N-allyl-N,O-acetals has been applied to the diastereoselective construction of precursors of 2-quaternary 4-pentenoic acids (82-97% ds). Best yields are obtained when alkoxides are used to deprotonate the intermediate oxazolinium salts.
烯酮 N-烯丙基-N,O-
乙醛的氮-克莱森重排已被应用于非对映选择性地构建 2-季
4-戊烯酸(82-97% ds)的前体。当使用烷氧基化合物对中间草唑啉鎓盐进行去质子化时,产量最高。