Divergent Method to <i>trans</i>-5-Hydroxy-6-alkynyl/alkenyl-2-piperidinones: Syntheses of (−)-Epiquinamide and (+)-Swainsonine
作者:Chang-Mei Si、Zhuo-Ya Mao、Han-Qing Dong、Zhen-Ting Du、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1021/acs.joc.5b00803
日期:2015.6.5
An efficient diastereoselective approach to access trans-5-hydroxy-6-alkynyl/alkenyl-2-piperidinones has been developed through nucleophilic addition of α-chiral aldimines using alkynyl/alkenyl Grignard reagents. The diastereoselectivity of alkenyl in C-6 position of 2-piperidinone was controlled by α-alkoxy substitution, while the alkynyl was controlled by the coordination of the α-alkoxy substitution
通过使用炔基/烯基格利雅试剂试剂亲核加成α-手性醛亚胺,已经开发了一种有效的非对映选择性方法,可用于反式-5-羟基-6-炔基/烯基-2-哌啶酮。α-烷氧基取代控制2-哌啶酮C-6位置链烯基的非对映选择性,而α-烷氧基取代和亚磺酰胺的立体化学则控制炔基。(-)-表喹酰胺和(+)-swainsonine的不对称合成证明了这种简单的级联过程的实用性。