Preparation of both enantiomers of a synthon for novel nucleoside analogs by enzymatic desymmetrization of a meso-diol with a methylene cyclopropane skeleton
作者:Germain Obame、Hélène Pellissier、Nicolas Vanthuyne、Jean-Bernard Bongui、Gérard Audran
DOI:10.1016/j.tetlet.2010.12.097
日期:2011.3
The enzymatic desymmetrization of methylenecyclopropane diol or its corresponding diacetate derivative, generated from a [2+1] cycloaddition between dioxepin and methylchlorocarbene, is described. After screening five commercial lipases, the two enantiomers of acetic acid 2-hydroxymethyl-3-methylene-cyclopropylmethyl ester are obtained in high yields and excellent enantioselectivities by using PFL
描述了亚甲基环丙烷二醇或其相应的二乙酸酯衍生物的酶促脱对称,该二甲基环氧丙烷是由二氧杂环庚烷和甲基氯卡宾之间的[2 + 1]环加成反应生成的。在筛选出五种商业脂肪酶后,通过在有机溶剂中使用PFL或LPP,可以高收率和优异的对映选择性获得乙酸2-羟基甲基-3-亚甲基-环丙基甲基酯的两种对映体。通过X射线分析建立了去对称产物的立体结构。我们还报道了这种非外消旋手性结构单元的新例子,其中旋光的迹象显着取决于溶剂并被反转。使用这些对映体纯的组成部分,还提出了新型核苷类似物的合成。