Oxidation of α-Trifluoromethyl Alcohols Using a Recyclable Oxoammonium Salt
作者:Christopher B. Kelly、Michael A. Mercadante、Trevor A. Hamlin、Madison H. Fletcher、Nicholas E. Leadbeater
DOI:10.1021/jo301477s
日期:2012.9.21
method for the oxidation of α-trifluoromethyl alcohols to trifluoromethyl ketones (TFMKs) using the oxoammonium salt 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate (1) is described. Under basic conditions, oxidation proceeds rapidly and affords good to excellent yields of TFMKs, without concomitant formation of the hydrate. The byproduct of the oxidation, 4-acetylamino-2
Spatiotemporal Control of Pre-existing Alkene Geometry: A Bio-Inspired Route to 4-Trifluoromethyl-2<i>H</i>-chromenes
作者:Svenja I. Faßbender、Jan B. Metternich、Ryan Gilmour
DOI:10.1021/acs.orglett.7b03859
日期:2018.2.2
Routes to prepare C4-trifluoromethyl analogues of the 2H-chromene scaffold are scarce: this is particularly striking given the importance of fluorine in pharmaceutical development. To address this limitation, a facile strategy has been developed that is reliant on catalytic, geometric isomerization of easily accessible allylic alcohols (up to >95:5) followed by intramolecular cyclization via Pd catalysis
Oxidation of α-Trifluoromethyl and Nonfluorinated Secondary Alcohols to Ketones Using a Nitroxide Catalyst
作者:Nicholas E. Leadbeater、Fabrizio Politano、William P. Brydon
DOI:10.1055/s-0042-1752398
日期:2023.5
A methodology for the oxidation of α-trifluoromethyl alcohols to the corresponding trifluoromethyl ketones is presented. A catalytic quantity of a nitroxide is used, and potassium persulfate serves as the terminal oxidant. The methodology proves effective for aromatic, heteroaromatic, and conjugated alcohol substrates. It can be extended to nonfluorinated secondaryalcohols and, in this case, can be