作者:Hideyuki Sugiyama、Takayuki Shioiri、Fumiaki Yokokawa
DOI:10.1016/s0040-4039(02)00607-x
日期:2002.5
amino acids, constituents of cyclomarin A, are described. The protected N-methylhydroxyleucine 2 was synthesized using Evans’ asymmetric azide-transfer reaction. The unusual amino acid 3 was prepared via diastereoselective methylation of the l-aspartic acid derived lactone 13. The stereoselective formation of threo-β-methoxyphenylalanine 4 was performed via aldol reaction using Schöllkopf's chiral glycine
描述了四种非常规氨基酸的立体选择性合成,它们是环marinA的组成部分。使用Evans的不对称叠氮化物转移反应合成了被保护的N-甲基羟基亮氨酸2。通过L-天冬氨酸衍生的内酯13的非对映选择性甲基化制备了不寻常的氨基酸3。使用Schöllkopf's手性甘氨酸烯醇酸酯通过醛醇缩合反应进行苏-β-甲氧基苯基丙氨酸4的立体选择性形成。通过AQN配体促进的Sharpless区域逆向不对称氨基羟基化方案实现了N-反向的戊烯基色氨酸5的合成。