Decarbonylation of α-tertiary amino acids application to the synthesis of polyhydroxylated indolizidines from D,L-pipecolic acid
作者:María J. Martín-López、Rosa Rodriguez、Francisco Bermejo
DOI:10.1016/s0040-4020(98)00689-9
日期:1998.9
The decarbonylation of the bicyclic α-tertiary carboxamido acid 11 led to the enamide 12, easily transformed into the indolizidine alkaloid 8,8a-trans-8-hydroxy-indolizidine 14. Likewise, the same process applied to the α-substituted pipecolic acid derivative 5 led to the unsaturated ester 6 which was easily transformed either into δ-coniceine 9 or to 14. The thermal fragmentation of the acyl derivative
双环α-叔羧酰胺酸11的脱羰基导致酰胺12,轻松转化为吲哚并立生物碱8,8a-反式-8-羟基吲哚并立胺14。同样,对α-取代的胡椒酸衍生物5进行相同的处理,得到不饱和酯6,该不饱和酯6容易转化为δ-可卡因9或14。酰基衍生物22的热裂解产生了已转化为(±)-swainsonine 26的烯酰胺24。