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Bis(imido)vanadium(V)-Catalyzed [2+2+1] Coupling of Alkynes and Azobenzenes Giving Multi-Substituted Pyrroles.

著者 Kawakita K , Beaumier EP , Kakiuchi Y , Tsurugi H , Tonks IA , Mashima K
J Am Chem Soc.2019 Feb 07 ; ():.
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The combination of VCl(THF) and N,N-bis(trimethylsilyl)aniline (1a) is an efficient catalyst for [2+2+1] coupling reaction of alkynes and azobenzenes, giving multi-substituted pyrroles. A plausible reaction mecha-nism involves the generation of a mono(imido)vanadium(III) species as an initiation step, where 1a served as an imido source with concomitant release of 2 equiv of ClSiMe, followed by a subsequent reaction with azobenzene to form a catalytically active bis(imido)vanadium(V) species via N=N bond cleavage.
PMID: 30731038 [PubMed - as supplied by publisher]
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