Process for catalytically preparing aromatic or heteroaromatic nitriles
View Patent ↗A process is described for catalytically preparing optionally substituted aromatic or heteroaromatic nitrites of the general formula (I) Ar—CN (I) by reacting the corresponding aryl halides of the general formula (II) Ar—X (II) in which X is chlorine, bromine, iodine, triflate, nonaflate, mesylate or tosylate and Ar is an optionally substituted aromatic or heteroaromatic radical, characterized in that the reaction is performed in the presence of a palladium compound, a phosphine of the general formula (III) or (IV) where R is an alkyl radical and R′, R″ and R′″ are each an alkyl radical or an aryl radical or heteroaryl radical and A is an alkylene or arylene radical, and potassium hexacyanoferrate(II) or potassium hexacyanoferrate(III), optionally in a solvent and optionally with addition of a base.
1. Process for catalytically preparing optionally substituted aromatic or heteroaromatic nitriles of the general formula (I)
Ar—CN (I)
by reacting the corresponding aryl halides of the general formula (II)
Ar—X (II)
in which
X is chlorine, bromine, iodine, triflate, nonaflate, mesylate or tosylate and
Ar is a phenyl and naphthyl optionally substituted with unsubstituted alkyl and halogen,
characterized in that the reaction is performed in the presence of a palladium compound, a phosphine comprising n-butyl bis(adamantly)phosphine or tri(tert-butyl)phosphine,
and potassium hexacyanoferrate(II), optionally in a solvent and optionally with addition of a base.
2. The process according to claim 1 , characterized in that the palladium compounds used are known palladium(0) complexes or palladium(II) salts or complexes.
3. The process according to claim 1 or 2 , characterized in that the palladium compounds used are palladium halides and complexes thereof, palladiumacetate, palladium-dibenzylideneacetone complexes or allylpalladium chloride dimer.
4. The process according to claim 1 characterized in that the palladium compound is used in an amount of 0.001 mol % to 10 mol % based on the aryl halide Ar—X used.
5. The process according to claim 1 , characterized in that the reaction is effected at temperatures of 20 to 220° C.
6. The process according to claim 1 , characterized in that the reaction is performed at ambient pressure.