Oxidative Addition of Aryl and Benzyl Trifluoroacetates to Zerovalent Palladium Complexes with Two Modes of C–O Bond Cleavage Processes
作者:Kazuhiro Nagayama、Isao Shimizu、Akio Yamamoto
DOI:10.1246/bcsj.72.799
日期:1999.4
The aryl trifluoroacetates oxidatively added to a zerovalent palladium complex 2a with acyl-O bondcleavage under mild conditions to give the corresponding trans-(aryloxo)(trifluoroacetyl)palladium complexes 3a—3c. But 4-nitrophenyl trifluoroacetate reacted with 2a to yield cis-[Pd(OC6H4-4-NO2)2(PMe3)2] 3d, which was produced with C–O bond activation followed by disproportionation reaction. In contrast
Oxidative Trifluoroacetoxylation of 1°, 2°, and 3° Benzylic C(sp<sup>3</sup>)–H Bond Donors Using <i>N</i>-Trifluoroacetoxyquinuclidinium Salts under Photoredox Catalysis
作者:Michael Hitt、Andrei N. Vedernikov
DOI:10.1021/acs.orglett.2c02946
日期:2022.10.28
trifluoroacetate was prepared in situ from quinuclidine N-oxide and (CF3CO)2O. Except for some electron-poor substrates, this reagent allows for the high-yielding oxidative trifluoroacetoxylation of 1°, 2°, and 3° benzylic C–H bonds under photocatalytic conditions. The trifluoroacetoxylation of an ibuprofen methyl ester allowed the selective functionalization of a 2° benzylic C–H bond. For alkylbenzenes, hydrogen-atom