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
A Weinreb amide approach to the synthesis of trifluoromethylketones
作者:DiAndra M. Rudzinski、Christopher B. Kelly、Nicholas E. Leadbeater
DOI:10.1039/c2cc35037h
日期:——
A novel route to access trifluoromethylketones (TFMKs) from Weinreb amides is reported. This represents the first documented case of the Ruppert–Prakash reagent (TMS–CF3) reacting in a constructive manner with an amide and enables synthesis of TMFKs without risk of over-trifluoromethylation.
Asymmetric Synthesis of Trifluoromethylated Amines via Catalytic Enantioselective Isomerization of Imines
作者:Yongwei Wu、Li Deng
DOI:10.1021/ja306771n
日期:2012.9.5
A new approach toward the asymmetric synthesis of optically active trifluoromethylated amines was enabled by an unprecedented, highly enantioselective catalytic isomerization of trifluoromethyl imines with a new chiral organic catalyst. Not only aryl but also alkyl trifluoromethylated amines could be obtained in high enantioselectivities.
[figure: see text] The asymmetric hydrogenation of trifluoromethyl ketones to yield chiral alpha-trifluoromethyl alcohols with enantiomeric excesses up to 98% was achieved in the presence of chiral rhodium-(amidephosphine-phosphinite) complexes.
Synthesis of chiral tertiary trifluoromethyl alcohols by asymmetric nitroaldol reaction with a Cu(ii)-bisoxazolidine catalyst
作者:Hanhui Xu、Christian Wolf
DOI:10.1039/c0cc02378g
日期:——
A highly enantioselective and diastereoselectivecopper(II)-bisoxazolidine catalyzednitroaldolreaction with aliphatic and aromatic trifluoromethyl ketones is described.