Asymmetric Syntheses of 1-Aryl-2,2,2-trifluoroethylamines via Diastereoselective 1,2-Addition of Arylmetals to 2-Methyl-<i>N</i>-(2,2,2-trifluoroethylidene)propane-2-sulfinamide
作者:Vouy Linh Truong、Madelaine S. Ménard、Isabelle Dion
DOI:10.1021/ol063001q
日期:2007.2.1
N-tert-butanesulfinamide (S)-1 with trifluoroacetaldehyde hydrate 2a afforded 2-methyl-N-(2,2,2-trifluoroethylidene)propane-2-sulfinamide 3. Without isolation and purification, imine 3 was added to various aryllithium reagents to give highly diastereomerically enriched adducts 5a-g. Acidic methanolysis of 5a-g provided the desired 1-aryl-2,2,2-trifluoroethylamine hydrochloride compounds 6a-g. [reaction: see text]
The ruthenium-catalyzed asymmetric reductiveamination of aryl-trifluoromethyl ketones affording high value primary α-(trifluoromethyl)arylmethylamines using cheap NH4OAc as the nitrogen source and H2 as the reductant is reported. This user-friendly and simple catalytic method tolerates various aromatic functions with electron-withdrawing or -donating substituents at the para- or meta-positions and
Rhodium-catalyzed diastereoselective 1,2-addition of arylboronic acids to chiral trifluoroethyl imine
作者:Vouy Linh Truong、Jennifer Y. Pfeiffer
DOI:10.1016/j.tetlet.2009.01.112
日期:2009.4
Rhodium-catalyzed 1,2-addition of arylboronic acids 4a-j to chiral trifluoroethyl imine 3 afforded diastereomerically enriched sulfinamides 5a-j. The chiral auxiliary of the sulfinamide products was readily removed under acidic methanolysis to provide the corresponding trifluoroethylamine analogs 6a-j. (C) 2009 Elsevier Ltd. All rights reserved.