Efficient Total Synthesis of (+)-Dihydropinidine, (−)-Epidihydropinidine, and (−)-Pinidinone
作者:Miroslav Kavala、František Mathia、Jozef Kožíšek、Peter Szolcsányi
DOI:10.1021/np100852p
日期:2011.4.25
The 2,6-disubstituted piperidine alkaloids (+)-dihydropinidine (1), (−)-epidihydropinidine (2) (as HCl salts), and (−)-pinidinone (3) were efficiently synthesized from (S)-epichlorohydrin (7) as common substrate using regioselective Wacker−Tsuji oxidation of alkenylazides 10 and 14 as well as a highly diastereoselective reduction of cyclic imine 11 as key steps. The protecting group free total syntheses
的2,6-二取代哌啶生物碱(+) - dihydropinidine(1),( - ) - epidihydropinidine(2)(如盐酸盐),和( - ) - pinidinone(3)被有效地从(合成小号) -表氯醇(7)作为常见的底物,是使用烯基叠氮化物10和14的区域选择性Wacker-Tsuji氧化以及对环亚胺11的高度非对映选择性还原作为关键步骤。保护基团的分类的全合成代表最新的对所有三个天然存在的生物碱(最高总收率最短路线1 - 3)。首次对(-)-epidihydropinidine盐酸盐(2 ·HCl)进行单晶X射线分析,证实其提议的绝对构型为(2 S,6 S),与分离的天然产物的构型相对应。