Stereoselective Synthesis of Substituted Bicyclo-[3.3.1]-nonan-9-ones by Additions of Enamines of Cyclohexanones to 4-Ethoxy-1,1,1-trifluorobut-3-ene-2-one
作者:Rebecca J Andrew、John M Mellor、Gillian Reid
DOI:10.1016/s0040-4020(00)00596-2
日期:2000.9
cyclohexanone to 4-ethoxy-1,1,1-trifluorobut-3-ene-2-one affords a single diastereoisomer of 4-ethoxy-2-hydroxy-2-trifluoromethylbicyclo[3.3.1]nonan-9-one. Similarly the pyrrolidine enamine of 4-methylcyclohexanone also in a highly diastereoselective manner affords a single bicyclic ketone. In the latter case a singlecrystalX-raydiffractionanalysis permits unambiguous determination of all stereochemical detail
Reactions of 2,2-dihydropolyfluoroalkylaldehydes with amines: a facile synthetic method for fluoroalkyl enaminoketones
作者:Xian-Jin Yang、Jin-Tao Liu、Fu-Lu Zhao
DOI:10.1016/j.jfluchem.2003.11.005
日期:2004.3
Reactions of 2,2-dihydropolyfluoroalkylaldehydes (1) with amines (2) were studied. Both aliphatic amines and electron-deficient aromatic amines readily reacted with I in acetonitrile and water under reflux to give fluoroalkyl enaminoketones (3) in high yields, while no condensed products were obtained by reactions of 1 with electron-rich aromatic amines under similar conditions. In the presence of triethylamine, however, the reaction of 1 with electron-rich aromatic amines at room temperature gave 3 in low yields. (C) 2003 Elsevier B.V. All rights reserved.
IMPROVED PROCESS FOR THE PREPARATION OF 2-TRIFLUOROMETHYL-5-(1-SUBSTITUTED)ALKYLPYRIDINES
申请人:Dow AgroSciences LLC
公开号:EP2646416A2
公开(公告)日:2013-10-09
PROCESS FOR THE PREPARATION OF
2-TRIFLUOROMETHYL-5-(1-SUBSTITUTED)ALKYLPYRIDINES
申请人:Roth Gary A.
公开号:US20120142933A1
公开(公告)日:2012-06-07
2-Trifluoromethyl-5-(1-substituted)alkylpyridines are produced efficiently and in high yield from an 4-alkoxy-1,1,1-trifluorobut-3-en-2-one by a condensation and a cyclization reaction. Both reactions are performed in the same nonpolar solvent without isolation and purification of intermediates.