Selective fluorination of (1R,3S)-(+)-camphoric acid with sulphur tetrafluoride. Preparation of fluorinated optically active derivatives of 1,2,2-trimethylcyclopentane
摘要:
Treatment of (1R,3S)-(+)-camphoric acid (1) with sulphur tetrafluoride at ambient temperature gives, in general, three products: 1,2,2-trimethyl-3-trifluoromethyl-1-cyclopentanoyl fluoride (2), 2,2,4,4-tetrafluoro-1,8,8-trimethyl-3-oxa-bicyclo[3.2.1] octane (3) and camphoroyl difluoride (4). The ratio of products strongly depends on the reaction time. Alkaline hydrolysis of (2) gives 1,2,2-trimethyl-3-trifluoromethyl-1-cyclopentanecarboxylic acid (5),quantitatively. All products exhibit optical activity.
Selective fluorination of (1R,3S)-(+)-camphoric acid with sulphur tetrafluoride. Preparation of fluorinated optically active derivatives of 1,2,2-trimethylcyclopentane
摘要:
Treatment of (1R,3S)-(+)-camphoric acid (1) with sulphur tetrafluoride at ambient temperature gives, in general, three products: 1,2,2-trimethyl-3-trifluoromethyl-1-cyclopentanoyl fluoride (2), 2,2,4,4-tetrafluoro-1,8,8-trimethyl-3-oxa-bicyclo[3.2.1] octane (3) and camphoroyl difluoride (4). The ratio of products strongly depends on the reaction time. Alkaline hydrolysis of (2) gives 1,2,2-trimethyl-3-trifluoromethyl-1-cyclopentanecarboxylic acid (5),quantitatively. All products exhibit optical activity.
EXPEDIENT SYNTHESIS OF (1R,3S)-(+)-3-(TRIFLUOROMETHYL)CAMPHONANIC ACID AND DERIVATIVES
作者:Wojciech Dmowski、Krystyna Piasecka-Maciejewska
DOI:10.1080/00304949909355713
日期:1999.4
Selective fluorination of (1R,3S)-(+)-camphoric acid with sulphur tetrafluoride. Preparation of fluorinated optically active derivatives of 1,2,2-trimethylcyclopentane
作者:Wojciech Dmowski、Tomasz Kozłowski
DOI:10.1016/s0022-1139(97)00016-x
日期:1997.7
Treatment of (1R,3S)-(+)-camphoric acid (1) with sulphur tetrafluoride at ambient temperature gives, in general, three products: 1,2,2-trimethyl-3-trifluoromethyl-1-cyclopentanoyl fluoride (2), 2,2,4,4-tetrafluoro-1,8,8-trimethyl-3-oxa-bicyclo[3.2.1] octane (3) and camphoroyl difluoride (4). The ratio of products strongly depends on the reaction time. Alkaline hydrolysis of (2) gives 1,2,2-trimethyl-3-trifluoromethyl-1-cyclopentanecarboxylic acid (5),quantitatively. All products exhibit optical activity.