processo para a preparação do ácido carboxílico aromático e heteroaromático, ésteres do ácido carboxílico e carboxamidas
Process for the preparation of aromatic and heteroaromatic carboxylic acids, carboxylic acid esters and carboxamides by the reaction of aromatic or heteroaromatic halides R-Xn, in which n=integer from 1 to 6, R=substituted or unsubstituted and aromatic or heteroaromatic radical and X=chlorine, bromi...
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Main Authors | , , , , , |
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Format | Patent |
Language | Portuguese |
Published |
06.10.2015
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Subjects | |
Online Access | Get full text |
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Summary: | Process for the preparation of aromatic and heteroaromatic carboxylic acids, carboxylic acid esters and carboxamides by the reaction of aromatic or heteroaromatic halides R-Xn, in which n=integer from 1 to 6, R=substituted or unsubstituted and aromatic or heteroaromatic radical and X=chlorine, bromine or iodine atom, with carbon monoxide and water, ammonia, alcohols or amines in the presence of bases and zero-valent or divalent palladium compounds and bidentate diphosphanes or complexes of zero-valent or divalent palladium with bidentate diphosphanes, in which use is made of bidentate diphosphanes (R1-)(R2-)P-Y-P(-R3)(-R4) in which R1 to R4=unsubstituted aryl radicals or aryl radicals substituted with at least one radical exhibiting a positive resonance effect or a positive inductive effect, or unsubstituted or substituted cycloalkyl radicals, and Y=hydrocarbon group with a total of 2 to 20 carbon atoms, in which at least one of the carbon atoms carries only one or no hydrogen atom as substituent; except for the reaction of 4-bromo-3-difluoromethyl-1-methylpyrazole with 2-(3,4,5-trifluorophenyl)aniline and carbon monoxide to give N-[2-(3,4,5-trifluorophenyl)phenyl]-3-difluoromethyl-1-methylpyrazole-4-carboxamide. |
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Bibliography: | Application Number: BR2009PI12255 |