Stereochemically defined C-substituted glutamic acids and their derivatives. 1. An efficient asymmetric synthesis of (2S,3S)-3-methyl- and -3-trifluoromethylpyroglutamic acids
作者:Vadim A Soloshonok、Chaozhong Cai、Victor J Hruby、Luc Van Meervelt、Nikolai Mischenko
DOI:10.1016/s0040-4020(99)00711-5
日期:1999.10
An efficient asymmetric synthesis of biologically important (2S,3S)-3-methyl- and (2S,3S)-3-trifluoromethylpyroglutamic acid has been developed. The method consists of diastereoselective Michael addition reaction between ethyl crotonate or ethyl 4,4,4-trifluorocrotonate and a Ni(II) complex of the chiral non-racemic Schiff base of glycine with (S)-o-[N-(N-benzylprolyl)amino]benzophenone (BPB) followed
已经开发出有效的不对称合成重要的生物学上重要的(2 S,3 S)-3-甲基-和(2 S,3 S)-3-三氟甲基焦谷氨酸。该方法包括巴豆酸乙酯或4,4,4-三氟巴豆酸乙酯和镍(II)配合物甘氨酸手性非外消旋的席夫碱与(非对映选择性之间的迈克尔加成反应的小号) - ö - [ ñ - (ñ -苄基脯氨酰基)氨基]二苯甲酮(BPB),然后加成水溶液分解加成产物。HCl和用NH 4处理所得的谷氨酸衍生物OH得到目标焦谷氨酸,同时回收了手性助剂BPB。发现加成反应的立体化学结果受到动力学控制。讨论了所观察到的立体化学偏好的机械原理。