Condensations of benzil with phenols and aryl ethers mediated by tin(IV) chloride pentahydrate
作者:Brian J Morrison、Oliver C Musgrave
DOI:10.1016/s0040-4020(02)00357-5
日期:2002.5
The reaction of benzil with phenol at 180°C in the presence of SnCl4·5H2O produces a benzofuran, a benzofuranol, a benzodifuran, and a benzofuranone. Anhydrous tin(IV) chloride also gives a benzofuranofuranone. Other phenols and their methyl ethers yield related products. The good yields of the benzo- and naphtho-furanones make the method an attractive alternative to the benzilic acid route to such
The iridium(III)/copper(II)‐catalyzed dehydrogenative coupling of salicylaldehydes with internal alkynes proceeds efficiently under atmospheric oxygen through aldehyde C−H bond cleavage and decarbonylation. A variety of benzofuran derivatives can be synthesized by the environmentally benign procedure. DFT calculations suggest that this unique transformation involves the facile deinsertion of CO in
In addition to ketene dithioacetal monoxides that were specially designed and have been used so far, general alkenyl sulfoxides of moderate reactivity have now become applicable as substrates in th...
A new method for synthesis of benzofurans and naphthofurans from 2-hydroxystilbene derivatives via an intermolecular cyclization is reported in this study with up to 94% isolated yield.
Regioselective Transition Metal-Free Catalytic Ring Opening of 2<i>H</i>-Azirines by Phenols and Naphthols; One-Pot Access to Benzo- and Naphthofurans
作者:Arnab Roy、Subrata Biswas、Surajit Duari、Srabani Maity、Abhishek Kumar Mishra、Aguinaldo R. de Souza、Asma M. Elsharif、Nelson H. Morgon、Srijit Biswas
DOI:10.1021/acs.joc.3c01266
日期:2023.11.17
naphthofuran derivatives are synthesized from readily available phenols and naphthols. Regioselective ringopenings of 2H-azirine followed by in situ aromatization using a catalytic amount of Brønsted acid have established the novelty of the methodology. The involvement of a series of 2H-azirines with a variety of phenols, 1-naphthols, and 2-naphthols showed the generality of the protocol. In-depth