Stereoselective synthesis of methyl 3α-ethyl-1,2,3,4,6,7,12,12bβ-octahydroindolo[2,3-a]quinolizine-1α-carboxylate: A key intermediate for the preparation of tacamine-type indole alkaloids
作者:Mauri Lounasmaa、Kimmo Karinen、David Din Belle、Arto Tolvanen
DOI:10.1016/0040-4039(96)00052-4
日期:1996.2
Methyl 3α-1,2,3,4,6,7,12,12bβ-cotahydroindolo[2,3-a]quinolizine-1α-carboxylate (6), a key intermediate for the synthesis of tacamine-type indole alkaloids, was prepared in six simple steps from methyl 5-(1′-hydroxyethyl)nicotinate (7). The last step was the catalytic hydrogenation of the two ethylidene isomers 14 and 15, both of which gave the target ester stereoselectively.
3α-1,2,3,4,6,7,12,12bβ-cotahydroindolo[2,3- a ] quinolizine -1α-羧酸盐(6)是合成他卡明型吲哚生物碱的关键中间体。由五个简单的步骤由5-(1'-羟乙基)烟酸甲酯(7)制备。最后一步是两个亚乙基异构体14和15的催化加氢,这两个异构体均立体选择性地提供了目标酯。