Selective free-radical dechlorination of 1,1-dichloro-2,2,2-trifluoroethyl difluoromethyl ether initiated thermally or by uv light: A practical and ‘green’ method for isoflurane synthesis
作者:Keith Ramig、Fernando Quiroz、Gerald G. Vernice、Leonid A. Rozov
DOI:10.1016/s0022-1139(96)03504-x
日期:1996.10
Treatment of 1,1-dichloro-2,2,2-trifluoroethyl difluoromethyl ether (3) with 2-propanol followed by either irradiation with UV light or heating with radical initiators gives the inhalational anesthetic isoflurane. Unlike most other common dechlorination methods, monoreduction is the exclusive process and the by-products acetone and HCl are relatively benign. Some comments about the mechanism of the reduction will be presented, along with solutions to problems encountered during scale-up.
Practical preparation of potentially anesthetic fluorinated ethyl methyl ethers by means of bromine trifluoride and other methods
作者:Tomas Hudlicky、Caiming Duan、Josephine W Reed、Fengyang Yan、Milos Hudlicky、Mary Ann Endoma、Edmond I Eger
DOI:10.1016/s0022-1139(99)00302-4
日期:2000.3
Synthetic methods, especially those that use brominetrifluoride as a fluorinating agent, are described for the preparation of a number of fluorinated ethyl methyl ethers in good yield and high purity. In all cases, medium-scale syntheses (8–22 g) of potentially anesthetic compounds have been accomplished. The compounds are of sufficient purity (>99%) for biological evaluation.