A novel strategy for the synthesis of D,L-glucosylceramide 1, a member of the glycosphingolipid class of natural products is described. Reagent-controlled asymmetric Brown allylboration gave excellent stereochemical control in the construction of adjacent stereocenters in the sphingoid base portion of the molecule. The trans-configured double bond was obtained as a single geometrical isomer by use
描述了一种合成D,L-
葡萄糖基神经酰胺1(一种糖鞘脂类
天然产物的成员)的新策略。试剂控制的不对称布朗烯丙基
硼化在分子
鞘氨醇碱基部分中相邻立体中心的构建中提供了出色的立体
化学控制。通过使用Schrock卡宾[(
CF3)2MeCO] 2Mo(= CHCMe2Ph)(= NC6H3-2,6-i-Pr2 ++ +)的
硅链烯烃复分解法,将反式构型双键作为单个几何异构体获得原位PhLi诱导的中间体5,6-二氢-2H-1,2-奥沙西林开环,然后在
DMSO中与TBAF进行原去甲
硅烷基化。通过长链酰胺的形成和整体脱保护完成了合成。