Preparation of New Chiral Building Blocks: Highly Enantioselective Reduction of Prochiral 1,3-Cycloalkanediones Possessing a Methyl Group and a Protected Hydroxymethyl Group at Their C2 Position with Baker's Yeast or CBS Catalyst
作者:Hideaki Watanabe、Mitsuhiro Iwamoto、Masahisa Nakada
DOI:10.1021/jo050349a
日期:2005.6.1
Highly enantioselective reduction of five-, six-, seven-, and eight-membered prochiral 1,3-cycloalkanediones possessing a methyl group and a protected hydroxymethyl group at their C2 position with baker's yeast or CBS catalyst and a new efficient and general method for preparing the 1,3-cycloalkanediones have been developed. These baker's yeast mediated reductions were found to produce corresponding
用面包酵母或CBS催化剂高度对映选择性还原五元,六元,七元和八元的手性1,3-环烷二酮,在其C2位上具有甲基和受保护的羟甲基基团,以及一种新的高效通用方法已经开发了制备1,3-环烷二酮的方法。发现这些面包酵母的介导还原反应可产生具有高光学纯度(> 99%ee)和高产率的相应酮醇。所制备的所有酮醇及其衍生物,手性结构单元均已得到充分表征,并且其绝对构型已得到确定。这些化合物对于复杂天然产物的收敛合成将是有用的。