Epoxy amino acids produced from allylglycines intramolecularly cyclised to yield four stereoisomers of 4-hydroxyproline derivatives
作者:Suvratha Krishnamurthy、Toru Arai、Kanae Nakanishi、Norikazu Nishino
DOI:10.1039/c3ra45184d
日期:——
Derivatives of 2-amino-4-pentenoic acid (allylglycine) were efficiently resolved using Subtilisin or acylase. The side-chain unsaturated bond of the enantiomerically pure amino acid with tert-butoxycarbonyl (Boc) protection was smoothly epoxidized with m-chloroperbenzoic acid. When the Boc protection of the amino group was removed, the amino group intramolecularly attacked the side-chain epoxide, generating
使用枯草杆菌蛋白酶或酰基转移酶可有效拆分2-氨基-4-戊烯酸(烯丙基甘氨酸)的衍生物。与对映体纯的氨基酸的侧链不饱和键叔丁氧羰基(BOC)保护顺利与环氧化米氯过苯甲酸。当氨基的Boc保护被去除时,氨基分子内攻击侧链环氧化物,生成具有五元环的化合物:4-羟基脯氨酸衍生物。通过环化反应形成了两个非对映异构产物,例如(2 S,4 S)-4-羟基脯氨酸苄基酯(cis - 8)和(2 S,4 R)-4-羟基脯氨酸苄酯(反式- 8)从(2形成小号) -氨基与侧链的环氧化物酸。化合物(2小号,4小号)-4-羟基脯氨酸苄酯(顺式- 8)转化为内酯(顺式-羟基脯氨酸内酯,10)具有去除苄醇。所述顺式-conformation是为分子内的酯交换反应是必不可少的; 事实上,观察到的无内酯形成的反式异构体(反式- 8)。顺式羟脯氨酸内酯与甘油三酯的分离与难于分离顺式和反式羟脯氨酸衍生物相反,反式异构体羟脯氨酸苄基