作者:Jun Ishihara、Rie Nonaka、Yuki Terasawa、Kin-ichi Tadano、Seiichiro Ogawa
DOI:10.1016/s0957-4166(00)86298-9
日期:1994.11
functionalization of the mixture afforded an enantiomerically pure bicyclic lactone 4. A double alkylation of 4 provided 3 stereoselectively. Dieckmann cyclization of a lactone-ester 2, which was prepared from 3, followed by protection of a hemiacetal hydroxyl group provided smoothly a tricyclic compound 1.
D-葡萄糖衍生的底物10的碱催化的分子内环化产物提供了双环β-羟基二酯6 R和6 S的非对映异构体混合物。混合物的进一步官能化得到对映体纯的双环内酯4。的双烷基化4提供3立体选择性。由3制备的内酯2的Dieckmann环化反应,然后保护半缩醛羟基,可顺利提供三环化合物1。