A Straightforward Approach towards α-Amino-β-keto Esters via Acylation of Chelated Amino Acid Ester Enolates
作者:Uli Kazmaier、Katharina Schultz、Laura Stief
DOI:10.1055/s-0031-1289674
日期:2012.2
Chelated enolates were found to be good nucleophiles for reactions with acyl halides affording α-amino-β-keto esters. In most cases, the reactions are over after a few minutes and preparatively useful yields are obtained, independent of the protecting groups and halides used. Besides acyl halides, also the corresponding imidazolides can be used with similar success. With chloroformates as acylating
发现螯合的烯醇化物是与提供α-氨基-β-酮酸酯的酰基卤反应的良好亲核试剂。在大多数情况下,反应在几分钟后结束并且获得制备有用的产率,而与所用的保护基团和卤化物无关。除了酰基卤之外,相应的咪唑啉也可以类似地成功使用。用氯甲酸酯作为酰化剂,可获得不同的被保护的氨基丙二酸酯。 酰化-酰基卤-氨基酸-氨基丙二酸酯-螯合的烯酸酯-酮