A novel synthesis of (2<i>S</i>)-3-(2,4,5-trifluorophenyl)propane-1,2-diol by sharpless asymmetric epoxidation method
作者:Derya Anil、Ramazan Altundas、Yunus Kara
DOI:10.1080/00397911.2019.1576050
日期:2019.3.19
(2S)-3-(2,4,5-trifluorophenyl)propane-1,2-diol by the Sharpless asymmetric epoxidation reaction has been achieved. 2,4,5-Trifluorobenzaldehyde with methyl 2-(triphenyl-λ5-phosphanylidene)acetate gave methyl (E)-3-(2,4,5-trifluorophenyl)acrylate in 83% yield. The reduction of ester group with DibalH followed by Sharpless asymmetric epoxidation gave ((2R,3R)-3-(2,4,5-trifluorophenyl)oxiran-2-yl)methanol
摘要 通过Sharpless 不对称环氧化反应合成了(2S)-3-(2,4,5-trifluorophenyl)propane-1,2-diol。2,4,5-三氟苯甲醛与2-(三苯基-λ5-亚膦基)乙酸甲酯以83%的产率得到(E)-3-(2,4,5-三氟苯基)丙烯酸甲酯。用 DibalH 还原酯基,然后进行 Sharpless 不对称环氧化,得到 ((2R,3R)-3-(2,4,5-三氟苯基)oxiran-2-yl) 甲醇。Pd/C 催化的环氧醇加氢 (2S)-3-(2,4,5-三氟苯基)丙烷-1,2-二醇 > 90% ee 和 71% 产率。图形概要