Syntheses of (R)- and (S)-enantiomeric 1,1,1-trifluoromethyl-2-alkanols with high enantiomeric purity controlled through derivatization with l-menthyl phthalate
作者:Vadim Mikhailenko、Daria Yedamenko、Ganna Vlasenko、Alexander Krivoshey、Valerii Vashchenko
DOI:10.1016/j.tetlet.2015.09.073
日期:2015.10
Readily available l-menthyl phthalate has been shown to be an effective derivatizing agent for determination of the enantiomeric purity of alkyl- and aryl-substituted 1,1,1-trifluoromethyl-2-alkanols using HPLC and GC. It has been shown that a previously described protocol for one-step enzymatic kinetic resolution results in the formation of the desired 1,1,1-trifluoromethyl-2-alkanols with 96–98%
已经显示,现成的邻苯二甲酸1-薄荷基酯是使用HPLC和GC测定烷基和芳基取代的1,1,1-三氟甲基-2-链烷醇的对映体纯度的有效衍生剂。已经显示,先前描述的一步酶动力学拆分方法可形成所需的1,96,98%ee的1,1,1-三氟甲基-2-链烷醇。发现通过重复酶促水解程序来富集三氟甲基链烷醇的(R)-异构体可将ee提高至99.9%。此外,在酶促水解过程中相应酯的过度转化允许获得对映体纯的(S)-1,1,1-三氟甲基-2-链烷醇。