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