Lipase catalyzed resolution of α-hydroxymethyl sulfones. Determination of absolute configuration by semiempirical calculation of CD spectra and verification by X-ray structure analysis
作者:Hans-Joachim Gais、Ingo von der Weiden、Jörg Fleischhauer、Josef Esser、Gerhard Raabe
DOI:10.1016/s0957-4166(97)00377-7
日期:1997.9
esterification of the methyl substituted alcohol and the benzyl substituted alcohol . The absolute configuration of and 1b was determined by measurement of their circular dichroism and the calculation of the CD spectra of 1a and 1b by semiempirical methods. The configurational assignment was verified by X-ray structure analysis of 1b and .
的南极假丝酵母脂肪酶催化的羟甲基砜的酯化和导致的分离(92%ee)和图1b(≥99%ee)的,分别。该酰氧甲基砜(ee≥99%)是由南极假丝酵母脂肪酶催化水解得到的。在甲基取代的醇和苄基取代的醇的酯化反应中,不仅南极念珠菌脂肪酶,洋葱假单胞菌脂肪酶也显示出相反的对映体分化。和1b的绝对配置通过测量它们的圆二色性和通过半经验方法计算1a和1b的CD光谱来确定。通过1b和的X射线结构分析验证了构型分配。