Stereoselective construction of the 1,1,1-trifluoroisopropyl moiety by asymmetric hydrogenation of 2-(trifluoromethyl)allylic alcohols and its application to the synthesis of a trifluoromethylated amino diol
作者:Qi Chen、Feng-Ling Qing
DOI:10.1016/j.tet.2007.09.013
日期:2007.11
The asymmetric hydrogenation of a series of 2-(trifluoromethyl)allylic alcohols 1a–g catalyzed by a BINAP–Ru(II) diacetate complex gave the corresponding products 2a–g in high yield (>90% yield) and high diastereoselectivity (>95% de). The asymmetric hydrogenation of 2-(trifluoromethyl)allylic alcohols provided an efficient stereoselective method to construct the 1,1,1-trifluoroisopropyl moiety. Based
BINAP-Ru(II)二乙酸酯络合物催化的一系列2-(三氟甲基)烯丙基醇1a - g的不对称氢化得到相应的产物2a - g,产率高(> 90%),非对映选择性高(> 95) %de)。2-(三氟甲基)烯丙基醇的不对称氢化为构建1,1,1-三氟异丙基部分提供了有效的立体选择性方法。基于(R)-2,2-二甲基-1,3-二氧戊环-4-甲醛与3,3,3-三氟异丙烯基锂的反应制得的2-(三氟甲基)烯丙基醇5a的不对称氢化,(2 R,3 S,4 R通过五个步骤以36%的总收率合成了)-4-三氟甲基-1-氨基戊烷-2,3-二醇9。