Activated α,β-unsaturated carboxylic acids undergo an unexpected domino condensation/aza-Michael/O→N acyl migration with carbodiimides, producing N,N-disubstituted hydantoins in good yields. An array of structurally varied aspartic acid-derived hydantoins, including some fluorinated derivatives, have been synthesized by this method, whose scope and limits are discussed.
活化的α,β-不饱和
羧酸与碳二
亚胺发生意想不到的多米诺骨牌缩合/氮杂-迈克尔/ O→N酰基迁移,以高收率生产N,N-二取代的乙内酰
脲。通过该方法合成了一系列结构变化的
天冬氨酸衍生的乙内酰
脲,包括一些
氟化衍
生物,并讨论了其范围和限制。