An Efficient Approach for Monofluorination via Aqueous Fluorolactonization Reaction of 2,3-Allenoic Acids with Selectfluor
摘要:
[GRAPHICS]We have developed a convenient method for the efficient monofluorination via the electrophilic fluorocyclization reaction of 2,3-allenoic acids with Selectfluor in MeCN in the presence of 10 equiv of H2O or even in pure water to afford beta-fluorobutenolides in moderate to high yields.
Copper-Catalyzed Cyclic Oxytrifluoromethylation of 2,3-Allenoic Acids to Trifluoromethylated Butenolides
作者:Qiong Yu、Shengming Ma
DOI:10.1002/chem.201302169
日期:2013.9.27
Rounding up: An efficient copper‐catalyzed cyclicoxytrifluoromethylation of 2,3‐allenoic acids under mild conditions, providing a straightforward approach to β‐trifluoromethylatedbutenolides has been developed. Based on the successful trapping of a CF3 radical intermediate, a mechanism involving π‐allylic copper(III) or radical intermediate is proposed.