Lead(IV) acetate mediated cleavage of β-hydroxy ethers: enantioselective synthesis of α-acetoxy carbonyl compounds
作者:Enrique Alvarez-Manzaneda、Rachid Chahboun、Esteban Alvarez、Ramón Alvarez-Manzaneda、Pedro E. Muñoz、Fermín Jimenez、Hanane Bouanou
DOI:10.1016/j.tet.2011.09.056
日期:2011.11
α-Acetoxy aldehydes or α-acetoxy ketones can be efficiently synthesized by treating 2,3-epoxy primary alcohols with lead tetraacetate. The reaction, which proceeds with complete regio- and stereoselectivity facilitates the enantioselective synthesis of α-acetoxy carbonyl compounds from allyl alcohols, via Sharpless epoxidation. Cyclic β-hydroxy ethers, with an oxygenated five-, six- or seven-membered
通过用四乙酸铅处理2,3-环氧伯醇可以有效地合成α-乙酰氧基醛或α-乙酰氧基酮。以完全的区域和立体选择性进行的反应有助于通过Sharpless环氧化由烯丙醇对映体选择性合成α-乙酰氧基羰基化合物。具有氧化的五元,六元或七元环的环状β-羟基醚被转化为α-乙酰氧基醚。