α,β-Epoxyketones are reduced by trimethoxysilane in the presence of a catalytic amount of lithium methoxide to yield the corresponding alcohols. This reaction system reveals divergent selectivity depending on the solvent; both anti-selectivity and syn-selectivity are observed iin less polar Et2O and in polar HMPA, respectively.
Stereoselective Reduction of α,β-Epoxy Ketones into erythro-α,β-Epoxy Alcohols with Sodium Borohydride in the Presence of Calcium Chloride
作者:Hideaki Fujii、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1246/cl.1992.967
日期:1992.6
erythro-α,β-Epoxyalcohols were prepared with high stereoselectivity by sodium borohydride reduction of the corresponding α,β-epoxyketones in the presence of calcium chloride or manganese(II) chloride regardless of the substituents on the epoxide ring.
无论环氧化物环上的取代基如何,在氯化钙或氯化锰 (II) 存在下,通过硼氢化钠还原相应的 α,β-环氧酮,以高立体选择性制备赤型-α,β-环氧醇。
Regio- and stereocontrolled synthesis of epoxy alcohols and triols from allylic and homoallylic alcohols via iodocarbonates
Iodocyclization of allylic alcohol derivatives containing internal nucleophiles. Control of stereoselectivity by substituents in the acyclic precursors
作者:A. Richard Chamberlin、Milana Dezube、Patrick Dussault、Mark C. McMills
DOI:10.1021/ja00356a020
日期:1983.9
La reaction d'acides hydroxy-3 alcene-4oiques avec l'iode en milieu biphasique neutre donne une cyclisation stereoselective habituellement en cis-hydroxy-3 iodo-4 lactone. Effet des substituants
La 反应 d'acides hydroxy-3 alcene-4oiques avec l'iode en milieu biphasique neutre donne une 环化立体选择性习惯 en cis-hydroxy-3 iodo-4 内酯。替代物的作用