Lipase-Catalyzed Asymmetric Desymmetrization of Prochiral 2,2-Disubstituted 1,3-Propanediols Using 1-Ethoxyvinyl Benzoate.
作者:Shuji AKAI、Tadaatsu NAKA、Yasushi TAKEBE、Yasuyuki KITA
DOI:10.1248/cpb.48.1519
日期:——
The lipase-catalyzed asymmetric desymmetrization of the prochiral 2, 2-disubstituted 1, 3-propanediols was studied using various types of 1-ethoxyvinyl esters (1a-i). Although 1a-e with aliphatic acyl groups were not sufficient, use of the benzoate (1f) in combination with Candida rugosa lipases converted acyclic diols (2, 6) and cyclic diols (11-14) to the optically active compounds (3f, 7f, 15f-18f), bearing a quaternary carbon center, with moderate-to-high optical yields. These products were fairly stable against racemization under acidic conditions.
使用各种1-乙氧基乙烯酯(1a-i)研究了脂肪酶催化下的手性2,2-二取代1,3-丙二醇的不对称去对称化。虽然带有脂肪族酰基的1a-e还不够,但使用苯甲酸酯(1f)与念珠菌脂酶结合,可将无环二醇(2,6)和环状二醇(11-14)转化为具有四元碳中心的光学活性化合物(3f,7f,15f-18f),光学收率中等至高。这些产品在酸性条件下对消旋化相当稳定。