Asymmetric preparation of 1,2,2,2-tetrafluoroethyl methyl ether, an intermediate in the synthesis of volatile anesthetics
作者:Leonid A. Rozov、Keith Ramig
DOI:10.1016/s0040-4039(00)60711-6
日期:1994.6
enantiomeric acid to its potassium salt followed by thermolysis in triethylene glycol/1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU) gives the enantiomers of 1,2,2,2-tetrafluoroethyl methyl ether (1) with a very high degree of stereospecificity. The use of DMPU as co-solvent results in a significant yield improvement.
通过(S)-(-)-1-苯乙胺/色谱/水解通过非对映异构酰胺的形成来拆分1-甲氧基四氟丙酸(2)。两种对映体均以≥99%ee获得。将每种对映体酸转化为其钾盐,然后在三乙二醇/ 1,3-二甲基-3,4,5,6-四氢-2(1 H)-嘧啶酮(DMPU)中热解,得到1,2,具有非常高的立体特异性的2,2-四氟乙基甲基醚(1)。DMPU作为助溶剂的使用可显着提高产量。