Enantioselective intramolecular CH insertion route to a key intermediate for the synthesis of trinem antibiotics
作者:Masahiro Anada、Shun-ichi Hashimoto
DOI:10.1016/s0040-4039(98)02055-3
日期:1998.12
A new route to the enantiomerically pure azetidin-2-one 3, a key intermediate for the synthesis of trinems, has been developed, incorporating enantioselective intramolecular CH insertion of α-methoxycarbonyl-α-diazoacetamide catalyzed by chiral Rh(II) complexes and diastereoselective arene hydrogenation as the key steps. The use of dirhodium(II) tetrakis[N-phthaloyl-(S)-tert-leucinate] as a catalyst
已开发出一条新的途径,将对映体纯的氮杂环丁烷-2-酮3(合成trinems的关键中间体)纳入了手性Rh(II)配合物催化的对映选择性分子内CH插入α-甲氧基羰基-α-重氮乙酰胺的新途径和非对映选择性芳烃加氢为关键步骤。使用四(N-邻苯二甲酰基- (S)-叔亮氨酸酯)(II)催化剂可在84%ee中产生所需的氮杂环丁酮,而四(N-邻苯二甲酰基) - (N-邻苯二甲酰- (S) -丙氨酸盐]提供了其对映体的84%ee。