Photoredox Activation of SF<sub>6</sub>for Fluorination
作者:T. Andrew McTeague、Timothy F. Jamison
DOI:10.1002/anie.201608792
日期:2016.11.21
We report the first practical use of SF6 as a fluorinating reagent in organic synthesis. Photoredoxcatalysis enables the in situ conversion of SF6, an inert gas, into an active fluorinating species by using visiblelight. Under these conditions, deoxyfluorination of allylic alcohols is effected with high chemoselectivity and is tolerant of a wide range of functional groups. Application of the methodology
Regio- and Stereoselective Allylic Trifluoromethylation and Fluorination using CuCF<sub>3</sub> and CuF Reagents
作者:Johanna M. Larsson、Stalin R. Pathipati、Kálmán J. Szabó
DOI:10.1021/jo4010074
日期:2013.7.19
Copper-mediated trifluoromethylation of allylic chlorides and trifluoroacetates was performed using a convenient Cu–CF3 reagent. The reaction is suitable for selective synthesis of allyl trifluoromethyl species. Mechanistic studies indicate that the reaction proceeds via a nucleophilic substitution mechanism involving allyl copper intermediates. The analogous Cu–F reagent was suitable for fluorination
Iridium-Catalyzed Allylic Fluorination of Trichloroacetimidates
作者:Joseph J. Topczewski、Timothy J. Tewson、Hien M. Nguyen
DOI:10.1021/ja2087213
日期:2011.12.7
allylic fluorination method utilizing trichloroacetimidates in conjunction with an iridium catalyst has been developed. The reaction is conducted at room temperature under ambient air and relies on Et(3)N·3HF reagent to provide branched allylic fluorides with complete regioselectivity. This high-yielding reaction can be conducted on a multigram scale and shows considerable functional group tolerance