A stereoselective methodology was developed for the construction of C-spiro-glycosides in two steps involving bromonium ion activated solvolytic ring opening of sugar derived 1,2-cyclopropanecarboxylates followed by a one-pot dehydrohalogenation, intramolecular hetero-Michael addition (IHMA) and ester hydrolysis. The obtained spirocyclic lactols were further converted to enantiomerically pure spirolactones.
本研究开发了一种立体选择性方法,通过两个步骤构建 C-螺糖苷,其中包括
溴离子激活糖衍生的 1,2-
环丙烷羧酸酯的溶解开环,然后进行单锅脱氢卤化、分子内杂迈克尔加成(IHMA)和酯
水解。得到的螺环内酯可进一步转化为对映体纯的
螺内酯。