Production Method for 1,2,2,2-Tetrafluoroethyl Difluoromethyl Ether (Desflurane)
申请人:Central Glass Company, Limited
公开号:US20190345086A1
公开(公告)日:2019-11-14
Fluoral is obtained by gas-phase fluorination of chloral in the presence of a catalyst and then reacted with trimethyl orthoformate, thereby readily forming 1,2,2,2-tetrafluoroethyl methyl ether as an intermediate for production of desflurane. 1,2,2,2-Tetrafluoroethyl difluoromethyl ether (desflurane) is produced with high yield from the thus-formed 1,2,2,2-tetrafluoroethyl methyl ether by chlorination and fluorination. This method enables efficient industrial-scale production of desflurane useful as an inhalation anesthetic
Asymmetric Synthesis of the Volatile Anesthetic 1,2,2,2-Tetrafluoroethyl Chlorofluoromethyl Ether Using a Stereospecific Decarboxylation of Unusual Stereochemical Outcome
作者:Leonid A. Rozov、Patrice W. Rafalko、Suzanne M. Evans、Linda Brockunier、Keith Ramig
DOI:10.1021/jo00110a041
日期:1995.3
Acid 1 is optically resolved by diastereomeric amide formation/chromatography/hydrolysis. Decarboxylation of the enantiomers of acid 1 gives the enantiomers of ether 2 with a very high degree of stereospecificity. The absolute configurations of both the starting acid and the ether product are determined to be (R)-(+) and(S)-(-). The data indicate that decarboxylation occurs with clean inversion of configuration. A mechanism is proposed to rationalize this. unusual result. The enantiomers of ether 2 are converted to diastereomers of the volatile anesthetic 3 by a route consisting of trichlorination of the methyl group to give 9, monofluorination to yield 10, and monoreduction to afford the target anesthetic.