Novel and Stereospecific Synthesis of (2<i>S</i>)-3-(2,4,5-Trifluorophenyl)propane-1,2-diol from<scp>D</scp>-Mannitol
作者:Derya Aktaş、Meryem Fıstıkçı、Özlem Gündoğdu、Hasan Seçen、M. Fethi Şahin、Ramazan Altundaş、Yunus Kara
DOI:10.1002/hlca.201500031
日期:2015.8
A stereospecific synthesis of (2S)‐3‐(2,4,5‐trifluorophenyl)propane‐1,2‐diol from D‐mannitol has been developed. The reaction of 2,3‐O‐isopropylidene‐D‐glyceraldehyde with 2,4,5‐trifluorophenylmagnesium bromide gave [(4R)‐2,2‐dimethyl‐1,3‐dioxolan‐4‐yl](2,4,5‐trifluorophenyl)methanol in 65% yield as a mixture of diastereoisomers (1 : 1). The Ph3P catalyzed reaction of the latter with C2Cl6 followed
的立体定向合成(2小号)- 3-(2,4,5-三氟苯基)丙烷-1,2-二醇d -mannitol已经研制成功。2,3- O-异亚丙基-D-甘油醛与2,4,5-三氟苯基溴化镁的反应生成[(4 R)-2,2-二甲基-1,3-二氧戊环-4-基](2,4非对映异构体(1:1)的混合物形式的5,5-三氟苯基)甲醇的收率为65%。后者与C 2 Cl 6的Ph 3 P催化反应,然后经Pd / C催化的氢化还原,得到(2 S)-3-(2,4,5-三氟苯基)丙烷-1,2-二醇,其> ee为99%,产率为65%。