Stereoselective Preparation of Enantiomerically Pure Annulated Carbohydrates Using Ring-Closing Metathesis
作者:David J. Holt、William D. Barker、Paul R. Jenkins、Jagannath Panda、Subrata Ghosh
DOI:10.1021/jo991392z
日期:2000.1.1
Ring-closing metathesis has been applied to a series of glucose derivatives to produce cyclopentene derivatives 5a and 5b, cyclohexene derivatives 8 and 9, cycloheptene 12, and cyclooctene 14. Spirocyclic dihydrofurans 19, 26a, and 26b, along with dihydropyran 22, were also produced. A range of fused oxepine derivatives 29a-c and one oxo-cyclononene 31 were also prepared. Cyclopentene 5b was subjected
闭环复分解已应用于一系列葡萄糖衍生物以产生环戊烯衍生物5a和5b,环己烯衍生物8和9,环庚烯12和环辛烯14。还与二氢吡喃22一起形成了环二氢呋喃19、26a和26b。生产的。还制备了一系列稠合的氧杂环丁烷衍生物29a-c和一个氧代-环壬烯31。对环戊烯5b进行一系列的氢化,NBS溴化处理,然后用锌粉处理以提供扩环产物35。当先用NBS处理环六环化合物8,再用锌粉处理后,这样的扩环就不会发生,从而生成醛39通过用于使环戊烯衍生物5b断裂的相同反应顺序,将螺二氢呋喃衍生物19转化为醛42。