Quinolizidines. XXV. An extension of the "lactim ether route" to the racemic syntheses of several indolo[2,3-a]quinolizidine alkaloids.
作者:TOZO FUJII、SHIGEYUKI YOSHIFUJI、HARUE ITO
DOI:10.1248/cpb.36.3348
日期:——
The "lactim ether route, " originally designed for unified racemic and chiral syntheses of the benzo[a]quinolizidine-type Alangium alkaloids, has been extended to cover the racemic syntheses of several indolo[2, 3-a]quinolizidine alkaloids (1 and 8c, d). The synthetic routes started from the lactams 5a, b and proceeded smoothly through the lactim ethers 6a, b, lactam ketones 7a, b, lactam alcohols 10a, b, and N-substituted lactams 9a, b.
内酰胺醚路线 "最初是为苯并[a]喹嗪类阿兰生物碱的统一外消旋和手性合成而设计的,现已扩展到几种吲哚并[2, 3-a]喹嗪类生物碱(1 和 8c、d)的外消旋合成。合成路线从内酰胺 5a, b 开始,通过内酰胺醚 6a, b、内酰胺酮 7a, b、内酰胺醇 10a, b 和 N-取代内酰胺 9a, b 顺利进行。