Asymmetric synthesis of indole alkaloids from (L)-tryptophan: formal syntheses of (-)-koumine, (-)-taberpsychine & (-)-koumidine
作者:Patrick D. Bailey、Neil R. McLay
DOI:10.1016/s0040-4039(00)79407-x
日期:1991.7
The reaction of (L)-tryptophan methyl ester with methyl 4-oxobutanoate under conditions of kinetic control gave a high yield of the cis-1,3-disubstituted tetrahydro-β-carboline (6); a simple five step procedure allowed this to be transformed into the optically pure (e.e. greater 95%) bridged ketone (−)-(17), whose (+) isomer has previously been used in the syntheses of (+)-koumine (1), (+)-taberpsychine
在动力学控制的条件下,(L)色氨酸甲酯与4-氧代丁酸甲酯反应,得到了高产率的顺式-1,3-二取代的四氢-β-咔啉(6)。一个简单的五步程序就可以将其转化为光学纯的(ee≥95%)桥接的酮(-)-(17),其(+)异构体先前已用于(+)-koumine(1 ),(+)-塔布丁碱(2)和(+)-尿苷(3)。