Copper(I) mediated highly diastereoselective conjugate addition of Grignard reagents to functionalised cycloalkenols: a general and efficient route for the stereoselective synthesis of 5- and 6-membered ring trisubstituted cycloalkanols
作者:Valéry Dambrin、Monique Villiéras、Pascal Janvier、Loı̈c Toupet、Hassen Amri、Jacques Lebreton、Jean Villiéras
DOI:10.1016/s0040-4020(01)00044-8
日期:2001.3
The conjugate addition of magnesium cuprates to various 2-silyloxycyclopentene and 2-silyloxycyclohexene carboxylates leads diastereoselectively to related syn–anti cyclopentanols and cyclohexanols in fair overall yields. The β-elimination occurring with free hydroxylic derivatives is also partially or totally avoided by concomitant in situ trapping of the generated enolates. Attempts to rationalise
在各种2-甲硅烷基氧基环戊烯和2-甲硅烷基氧基环己烯的羧酸酯中共价添加铜酸钾镁,非对映选择性地以合理的总收率产生了相关的顺式-反式环戊醇和环己醇非对映异构体。通过伴随地原位捕获所产生的烯醇化物也部分或完全避免了与游离羟基衍生物发生的β-消除。讨论了使我们的结果合理化的尝试。