Facile preparation of difluoromethyl- and monofluoromethyl-containing amides via Ritter reaction
作者:Jun Liu、Chuanfa Ni、Ya Li、Laijun Zhang、Guanyu Wang、Jinbo Hu
DOI:10.1016/j.tetlet.2006.07.079
日期:2006.9
difluoromethylated acetamides in good yields, which is remarkably more efficient than the previously reported Ritter reactions with corresponding trifluoromethylated carbinols. Similarly, monofluoromethylated and (benzenesulfonyl)difluoromethylated carbinols have shown good reactivity in the Ritter reactions. Since the acetamides can be mildly deacetylated to give amines, the present methodology provides a convenient
Regioselective Substitution of Phenols with Trifluoroacetaldehyde Ethyl Hemiacetal
作者:Yuefa Gong、Katsuya Kato、Hiroshi Kimoto
DOI:10.1246/bcsj.74.377
日期:2001.2
Phenol did not react directly with trifluoroacetaldehyde ethyl hemiacetal. In the presence of catalytic amounts of anhydrous potassium carbonate, however, the reaction readily occurred. The p-substituted product 4-(2,2,2-trifluoro-1-hydroxyethyl)phenol predominated. In contrast, the reaction catalyzed by zinc halide predominantly produced the o-substituted product. Corresponding reactions of several
Nucleophilic Trifluoromethylation of Carbonyl Compounds: Trifluoroacetaldehyde Hydrate as a Trifluoromethyl Source
作者:G. K. Surya Prakash、Zhe Zhang、Fang Wang、Socrates Munoz、George A. Olah
DOI:10.1021/jo400202w
日期:2013.4.5
feasible nucleophilic trifluoromethylating protocol has been developed using trifluoroacetaldehyde hydrate as an atom-economical trifluoromethyl source. The reaction was found to be applicable to the nucleophilic trifluoromethylation of a broad spectrum of carbonylcompounds with satisfactory yields in general. DFT calculations have been performed to provide mechanistic insight into the present and related
Nucleophilic trifluoromethylation and difluorination of substituted aromatic aldehydes with Ruppert’s and Deoxofluor™ reagents
作者:Rajendra P. Singh、Debashis Chakraborty、Jean’ne M. Shreeve
DOI:10.1016/s0022-1139(01)00447-x
日期:2001.10
yaryl)ethanols (6c–g) by reacting Ruppert’s reagent, (trifluoromethyl)trimethylsilane (TMSCF3), with appropriate substrates in the presence of a catalytic amount of cesium fluoride are described. A versatile route to the synthesis of substituted aryl difluoromethane derivatives (8h–l, 10m, 12n, o, 14p) and the reactivity of substituted aromatic aldehydes towards bis(2-methoxyethyl)aminosulfur trifluoride
PALLADIUM AND NICKEL-CATALYZED PERFLUOROALKYLATION OF ALDEHYDES USING ZINC AND PERFLUOROALKYL HALIDES
作者:Neil J. O’Reilly、Masamichi Maruta、Nobuo Ishikawa
DOI:10.1246/cl.1984.517
日期:1984.4.5
A room temperature method for the conversion of perfluoroalkyl iodides to α-perfluoroalkyl carbinols under Pd or Ni catalysis is reported. The use of trifluoromethyl bromide provides an economical procedure for trifluoromethyl substituted carbinols.