The palladium-catalyzed benzylic-like nucleophilicsubstitution of acetates derived from benzofuran, benzothiophene and indole was investigated. The asymmetric substitution on racemic 1-(2-benzofuryl)ethyl acetate gave disappointing results, but the substitution product was obtained in 98% ee from (S)-1-(2-benzofuryl)ethyl acetate with overall retention of configuration.
Catalyst-free electrosynthesis of benzothiophenes from 2-alkenylaryl disulfides
作者:Juyeong Lee、Eunsoo Yu、Cheol-Min Park
DOI:10.1039/d2ob01402e
日期:——
The synthesis of benzothiophenes through electrosynthesis under oxidant- and metal-free conditions has been discovered. Electrolysis of symmetrical 2-alkenylaryl disulfides using an undivided cell leads to the formation of the corresponding benzothiophenes in good to moderate yields with good functional group tolerance. The usefulness of this methodology was further investigated with a scale-up experiment
Deoxygenative alkylation of benzylalcohols was realized by using acetate as the alcohol activation group. The C–O bond homolysis is achieved by a boryl radical-promoted β-scission process. The strategy is amenable to a variety of benzylalcohols, including primary, secondary, and more challenging tertiary alcohols. The synthetic practicability was demonstrated by a gram-scale one-pot reaction.