An asymmetric 1,4-addition reaction of 5H-oxazol-4-ones to alkynones using chiral guanidine catalysts bearing a hydroxy group at the appropriate position was developed, and applied to several substrates. The method provides a synthetically useful enone-substituted α-hydroxy acid derivatives with a chiral quaternary α-carbon atom.
使用在适当位置带有羟基的手性
胍催化剂,开发了 5H-
恶唑-4-酮与炔酮的不对称 1,4-加成反应,并将其应用于多种底物。该方法提供了合成上有用的具有手性季α-碳原子的烯酮取代的α-羟基酸衍
生物。