Highly Stereoselective Synthesis of Trifluoromethylated Compounds via Ester-Enolate [2,3]-Wittig and [3,3]-Ireland−Claisen Rearrangements
作者:Tsutomu Konno、Hideki Umetani、Tomoya Kitazume
DOI:10.1021/jo961246i
日期:1997.1.1
have been obtained in optically pure forms via effective enzymatic kinetic resolution and then converted into (E)- or (Z)-allylic alcohols. [2,3]-Wittig rearrangement of the corresponding [[gamma-(trifluoromethyl)allyl]oxy]acetic acidmethylesters afforded alpha-hydroxy-beta-(trifluoromethyl)-gamma,delta-unsaturated carboxylic acidmethylesters in good yields. The rearrangement of (Z)-substrates proceeded
Application of the modified Mosher method using high-field FT 1H NMR to the 2-methoxy-2-phenyl-2-trifluoromethyl acetic acid (MTPA) derivatives of fluorinated secondaryalcohols indicates that this method may be generally used to determine the absoluteconfigurations of these materials.
使用高场FT 1 H NMR的改良Mosher方法在氟化仲醇的2-甲氧基-2-苯基-2-三氟甲基乙酸(MTPA)衍生物上的应用表明,该方法通常可用于确定绝对构型这些材料。