Stereocontrolled synthesis of R or S E or Z unsaturated α—amino acids by enantio- and diastereoselective epoxidation of δ-hydroxy allylic phosphine oxides
作者:Jonathan Clayden、Eric W. Collington、Stuart Warren
DOI:10.1016/s0040-4039(00)91787-8
日期:1993.2
Epoxidation of δ-hydroxy allylic phosphine oxides 5 with m-CPBA can be syn selective. All stereoisomers of epoxy alcohols 6 are available when this method is used in tandem with an anti selective Sharpless kinetic resolution. The stereoisomers of epoxy alcohols 6 can be transformed stereospecifically into single isomers of unsaturated α—amino acids 7. A mechanistic explanation for the stereoselectivity
δ羟基烯丙基膦氧化物的环氧化5与米-CPBA可以顺式选择性。当此方法与抗选择性Sharpless动力学分辨率串联使用时,可以使用环氧醇6的所有立体异构体。环氧醇6的立体异构体可以立体定向地转化为不饱和α-氨基酸7的单一异构体。提出了在m -CPBA环氧化反应中观察到的立体选择性的机理解释。