Kinetic and thermodynamic effects in the thermal electrocyclic ring-openings of 3-fluorocyclobutene, 3,3-difluorocyclobutene, and 3-(trifluoromethyl)cyclobutene
Kinetic and thermodynamic effects in the thermal electrocyclic ring-openings of 3-fluorocyclobutene, 3,3-difluorocyclobutene, and 3-(trifluoromethyl)cyclobutene
作者:William R. Dolbier、Thomas A. Gray、Jeffrey J. Keaffaber、Lech Celewicz、Henryk Koroniak
DOI:10.1021/ja00157a055
日期:1990.1
Deoxofluorination of Aliphatic Carboxylic Acids: A Route to Trifluoromethyl-Substituted Derivatives
作者:Maksym Bugera、Serhii Trofymchuk、Karen Tarasenko、Olga Zaporozhets、Yurii Pustovit、Pavel K. Mykhailiuk
DOI:10.1021/acs.joc.9b02596
日期:2019.12.20
A practical method for the synthesis of functionalized aliphatic trifluoromethyl-substituted derivatives from aliphatic acids is developed. The transformation proceeds with sulfur tetrafluoride in the presence of water as a key additive. Compared to previous methods, the reaction gives products with full retention of stereo- and absolute configuration of chiral centers.