Ruthenium diacetate-catalysed oxidative alkenylation of C–H bonds in air: synthesis of alkenyl N-arylpyrazoles
作者:Percia B. Arockiam、Cedric Fischmeister、Christian Bruneau、Pierre H. Dixneuf
DOI:10.1039/c1gc15875a
日期:——
Ru(OAc)2(p-cymene) catalyses the directed dehydrogenative alkenylation of N-aryl pyrazoles by styrene and alkyl acrylates in the presence of a catalytic or stoichiometric amount of Cu(OAc)2·H2O in air; the acetic acid solvent plays a key role. With arene electron-donating groups, ruthenium-catalysed ortho-dialkenylation with alkyl acrylates can be obtained. A new method to generate the oxidative homocoupling of N-phenylpyrazole is provided with the Ru(OAc)2(p-cymene) catalyst.
Direct alkenylation of 1-phenylpyrazoles with alkenes such as acrylates accompanied by regioselective C–H bond cleavage proceeds efficiently under ruthenium catalysis in the presence of a copper oxidant. The procedure is also applicable to 2-phenylbenzothiazole and benzanilide.
Ruthenium-bipyridine complex catalyzed C–H alkenylation of arylpyrazole derivatives
作者:Sanchari Shome、Surya Prakash Singh
DOI:10.1007/s12039-018-1478-4
日期:2018.7
performed under the eco-friendly solvent system. The diverse functional group tolerance of this protocol opened up a new insight to the use of ruthenium(II) bipyridine complexes as a productive method for the oxidative heterocoupling of N-arylpyrazole. Graphical Abstract Synopsis Ruthenium(II)-Bipyridine catalyst was used for directive C–C alkenylation of arylpyrazoles and aryloxazolines under additive-