Geminal‐dichloromethyl derivatives could be efficiently synthesized by the highly chemoselective platinum on carbon‐catalyzed mono‐dechlorination of trichloromethyl substrates in dimethylacetamide (DMA) as a specific solvent at 25 °C under a hydrogen atmosphere.
A Convenient Synthesis of α-Fluoro Carboxylic Acids
作者:James E. Oliver、Rolland M. Waters、William R. Lusby
DOI:10.1055/s-1994-25457
日期:——
Conditions have been developed whereby treatment of 1,1,1-trichloro-2-carbinols with tetrabutylammonium fluoride and cesium fluoride provides 2-fluoro carboxylic acids. The methodology was used to prepare fluoro derivatives of two fatty acids and of the pheromone of the European corn borer.
Enantioselective synthesis of 2-fluoro carboxylic acids from Trichloromethyl carbinols: an efficient approach to chiral fluorine introduction into insect sex pheromones
作者:Achot P. Khrimian、James E. Oliver、Rolland M. Waters、Sini Panicker、Jesse M. Nicholson、Jerome A. Klun
DOI:10.1016/0957-4166(95)00415-7
日期:1996.1
Chiral syntheses of 2-fluoro carboxylic acids were achieved (ee greater than or equal to 92 %, yield 50-60 %) by stereoselective conversion (with inversion of configuration) of optically active trichloromethyl carbinols to fluoroacids with tetrabutylammonium fluoride. Fluorinated pheromone analogs of the European corn borer, Ostrinia nubilalis, and of the beet armyworm, Spodoptera exigua, were synthesized.