Palladium-Catalyzed Direct Arylation of Polysubstituted Benzofurans
摘要:
An efficient access to 2-substituted 3-arylbenzofurans through a palladium-catalyzed C3 direct arylation of 2-substituted benzofurans with aryl bromides is described. The scope and limitation of this reaction was studied. The method tolerates a variety of functional groups on the aryl halide and has been successfully extended to polysubstituted benzofurans to obtain the corresponding 3-arylbenzofurans with good to excellent yields.
2,3-Diaroyl benzofurans from arynes: sequential synthesis of 2-aroyl benzofurans followed by benzoylation
作者:Kashmiri Neog、Babulal Das、Pranjal Gogoi
DOI:10.1039/c8ob00631h
日期:——
strategy for the direct synthesis of 2-aroyl benzofuransfrom aryne precursors has been developed. This reaction proceeds via C–O and C–C bond cleavage as well as C–O and C–C bond formation in a single reaction vessel. The methodology provides good yields of 2-aroyl benzofurans and tolerates a variety of functional groups. The synthesized 2-aroyl benzofurans were further benzoylated at 3-positions and
Syntheses of 2-Aroyl Benzofurans through Cascade Annulation on Arynes
作者:Pashikanti Gouthami、Lahu N. Chavan、Rambabu Chegondi、Srivari Chandrasekhar
DOI:10.1021/acs.joc.8b00360
日期:2018.3.16
The highlyefficient and expedient route for the syntheses of 2-aroyl benzofurans has been developed via the cascade [2+2] followed by a [4+1] annulation on arynes. The overall transformation proceeded through the formation of ortho-quinone methide by the insertion of transient aryne into N,N-dimethylformamide and subsequent trapping with sulfurylide. Moreover, this transformation has a broad range