作者:Yasser Samir Sokeirik、Kazuyuki Sato、Masaaki Omote、Akira Ando、Itsumaro Kumadaki
DOI:10.1016/j.tetlet.2006.02.078
日期:2006.4
Reduction of perfluoroalkyl ketones with chiral lithium alkoxides gave chiral α-perfluoroalkyl alcohols in high enantiomeric excesses. Interestingly, reaction of 2,2,2-trifluoroacetophenone (1) with lithium (S)-1-phenylethoxide (2) gave (S)-2,2,2-trifluoro-1-phenylethanol (3), while the same reaction of perfluorooctan-1-one (7) with 2 gave (R)-1H-1-phenylperfluorooctanol (8). Based on the speculation
用手性烷醇锂还原全氟烷基酮得到高对映体过量的手性α-全氟烷基醇。有趣的是,2,2,2-三氟苯乙酮(1)与(S)-1-苯基乙氧基锂(2)反应生成(S)-2,2,2,2-三氟-1-苯乙醇(3),而相同的反应将全氟辛烷-1-酮(7)与2进行反应,得到(R)-1 H -1-苯基全氟辛醇(8)。根据机理推测,该反应的空间效应顺序为C 7 F 15 >取代苯基> CF 3。