作者:Jan Alexander Barten、Enno Lork、Gerd-Volker Röschenthaler
DOI:10.1016/j.jfluchem.2003.09.008
日期:2004.6
Selected imines reacted with hexafluoroacetone non-catalyzed at ambient temperature to give β-hydroxy-β-bis(trifluoromethyl) imines in good to excellent yields. For the imines of acetone, pentan-3-one, and of cyclohexanone a 1:2 reaction was observed giving iminodiols; for N,N′-bis(propylidene)ethylene diamine an iminotetrol was formed. The diol derivative of N-isopropyl-propylidene amine could be
Novel and facile synthesis of fluorinated enamino ketones and amino alcohols
作者:Jan A Barten、Alexander A Kadyrov、Enno Lork、Gerd-Volker Röschenthaler
DOI:10.1016/s0022-1139(02)00102-1
日期:2002.7
react via their enamine tautomers with terminal perfluorinated epoxides, e.g. hexafluoropropene oxide to produce fluorinated enamino ketones or imino ketones. In contrast, internal perfluorinated linear epoxides and one cyclic epoxide yield intermediate imino alcohols, which in one case added hexafluoroacetone, furnishing a new imino diol investigated by X-ray diffraction.
Simple access to novel β-hydroxy-β-trifluoromethyl imines
作者:Jan Alexander Barten、Kazumasa Funabiki、Gerd-Volker Röschenthaler
DOI:10.1016/s0022-1139(01)00500-0
日期:2002.1
Selected imines reacted with three different trifluoromethyl group-containing ketones in a non-catalyzed manner at ambient temperature to give the corresponding beta-hydroxy-beta-trifluoromethyl imines in good to excellent yields. With 1,1,1-trifluoroacetone a 1:1 and a 2:1 reaction product was obtained. The reduction of 2-isopropylimino-4-phenyl-5,5,5-trifluoropentan-4-ol led to a 5:1 diastereomeric mixture of the corresponding amine, whose dominant form was found to be (2S, 4R) 4-isopropylamino-4-phenyl-2-trifluoromethyl-butan-2-ol in the solid state. Hydrolysis in one case gave the respective beta-hydroxy ketone. (C) 2002 Elsevier Science B.V. All rights reserved.
Lipase-catalyzed Asymmetric Synthesis of Enantiomerically Pure (2<i>S</i>,4a<i>S</i>,8<i>S</i>)-4a,8-Dimethyl-2,3,4,4a,5,6,7,8-octahydro-2-naphthalenol
a key intermediate in the synthesis of natural geosmin (1), was prepared by enzymatic kinetic resolution. When racemic 3 was submitted to lipase (PS-30)-catalyzed asymmetric acetylation, employing vinyl acetate as the acyldonor, requisite product (+)-3 with a high enantiomeric excess was attained as the remaining alcohol. Recrystallization resulted in an enantiomerically pure sample.