Synthesis of carbonylated heteroaromatic compounds via visible-light-driven intramolecular decarboxylative cyclization of o-alkynylated carboxylic acids
An efficient strategy for the easy access to carbonylated heteroaromatic compounds has been developed via a visible-light-promoted intramolecular decarboxylative cyclization reaction of o-alkynylated carboxylic acids. This method is characterized by its benign conditions and the tolerance to a wide range of functionalities.
A radical cascade cyclization of 2-alkynylthioanisoles with α-oxocarboxylic acids with AgNO3 has been described. This reaction provides a novel route to directly access 3-acylbenzothiophenes from simple chemical feedstocks. In particular, the utility of the approach was demonstrated by its application to the synthesis of a polymerization inhibitor and a raloxifene precursor.
Redox-Neutral Arylations of Vinyl Cation Intermediates
作者:Daniel Kaiser、Luis F. Veiros、Nuno Maulide
DOI:10.1002/adsc.201600860
日期:2017.1.4
present a new unified concept for C−C bond formation under redox‐neutral conditions. Our strategy hinges upon interception of a vinyl cation with a sulfoxide resulting in simultaneous C–C and C−O bond formation and arylation. A range of structurally diverse vinyl cations are generated in situ in the presence of a sulfoxide, resulting in hydrative arylation, direct arylation of enol triflates and interrupted
Mercury(II)-Catalyzed Cyclization of 2-Alkynylphenyl Alkyl Sulfoxides Provides 3-Acylbenzo[<i>b</i>]thiophenes
作者:Cheng-Han Lin、Chin-Chau Chen、Ming-Jung Wu
DOI:10.1002/chem.201202704
日期:2013.2.18
Ring cyclization: A mercury‐catalyzed cyclization reaction to provide 3‐benzoylbenzo[b]thiophenes was achieved in good yields by treatment of 2‐alkynylphenyl alkylsulfoxides with mercury chloride and 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) in benzene heated at reflux for 24 h (see scheme).
环环化:通过用氯化汞和2,3-二氯-5,6-二氰基1-4,4处理2-炔基苯基烷基亚砜,以良好的收率实现了汞催化的环化反应以提供3-苯甲酰基苯并[ b ]噻吩苯中的苯并醌(DDQ)加热回流24小时(请参阅方案)。