Synthesis of γ,δ-unsaturated 6-hydroxy substituted α-amino acids by palladium-catalyzed alkylation of monoepoxydienes
作者:Angel Mazón、Carmen Nájera、Jesús Ezquerra、Concepción Pedregal
DOI:10.1016/s0040-4039(97)00273-6
日期:1997.3
Monoepoxydienes 1, derived from acyclic and cyclic conjugated dienes, react under neutral conditions with the benzophenone imine of glycine nitrile 4 in the presence of a catalytic amount of Pd(PPh3)4 (5% mol) to afford the corresponding unsaturated 6-hydroxy substituted α-amino acids 5 in a regio (1,4-addition) and stereoselective manner. However, the benzophenone imine of glycine ethyl ester 2 only
Monoepoxydienes 1,从无环和环状共轭二烯衍生的,用甘氨酸腈的二苯甲酮亚胺在中性条件下进行反应4中的Pd(PPh催化量的存在3)4(5%摩尔),得到相应的不饱和的6-羟基以区域(1,4-加成)和立体选择的方式取代α-氨基酸5。然而,的二苯甲酮亚胺甘氨酸乙酯2只与单环氧化物丁二烯至配料区域选择性和立体选择性乙基(4-反应ë)-6-羟基-2-(二苯基亚甲基)氨基-4-己烯酸甲酯(3)一个非对映体bulgecinine的前体。