(1R)-1-Deuterated alcohols with high enantiomeric excess were prepared via TiCl4/Et3SiD reduction of acetals arising from the reaction of aldehydes with (1S,2S)-3,3,3-trifluoro-1-phenylpropane-1,2-diol 9. Such a chiral auxiliary was synthesized in an enantiomerically pure form starting from L-mandelic acid. Due to its benzylic nature, it was easily removed from the reaction product of the reductive 1,3-dioxolane ring-cleavage to afford the desired alpha-deuterated alcohol. (C) 2009 Elsevier Ltd. All rights reserved.
通过TiCl4/Et3SiD还原由醛与(1S,2S)-3,3,3-三
氟-
1-苯基丙烷-1,2-二醇9反应生成的
乙缩醛,制备了具有高对映体过量的(1R)-1-
氘醇。该手性助剂由L-苯
乳酸开始,以消旋纯的形式合成。由于其苄基性质,它可轻易地从还原开环的1,3-二氧杂
环戊烷产物中去除,从而得到所需的α-
氘醇。© 2009 Elsevier Ltd. 保留所有权利。