intramolecular cyclization to 5-aminooxazoles. Despite the formation of the aryl anion as a key intermediate, the reaction displays a stereoconservative course, allowing for the preparation of enantiomerically pure α-benzoylamino amides. Finally, the synthetic utility of the reported MCR was exemplified by the preparation of proglumide, a cholecystokinin antagonist.
近年来,Aryne
化学已受到广泛关注,并且据报道
异氰酸酯是一组多组分转化中有效的亲核伴侣。在这项研究中,我们证明了叔α-单取代的α-异
氰基乙酰胺可有效地与
水和苯并偶联,从而提供直接且无
金属的高密度官能化α-苯甲酰
氨基酰胺,而无需与分子内环化成
5-氨基恶唑的竞争。尽管形成了芳族阴离子作为关键中间体,但该反应仍显示出立体保守过程,从而可以制备对映体纯的α-苯甲酰
氨基酰胺。最后,已报道的MCR的合成效用以制备
丙谷胺(一种胆囊收缩素拮抗剂)为例。