开发了一种自由基中继策略,用于在可见光照射下,在光催化剂的存在下,通过甲基(2-炔基苯基)亚砜与偏亚硫酸氢钠的反应生成3-(甲基磺酰基)苯并[ b ]噻吩。通过使用催化量的甲基亚磺酸钠作为引发剂,该光诱导的磺酰化在温和条件下有效地进行。在反应过程中,原位生成的甲基自由基是关键中间体,它与二氧化硫结合进行自由基中继,从而生成含甲基磺酰基的化合物。
Three‐Component Synthesis of 3‐(Arylsulfonyl)benzothiophenes Using Acetic Acid as a Quencher for Methyl Radical‐Mediated Side Reactions
作者:Vighneshwar Shridhar Bhat、Anna Lee
DOI:10.1002/adsc.202300099
日期:——
one-pot, three-component synthesis of 3-(arylsulfonyl)benzothiophenes was developed. The reaction did not require any catalysts or additives. The desired products were obtained via an intramolecular radical cyclization. Acetic acid was employed as the solvent and a quencher for side reactions involving methyl radicals. Moreover, inexpensive potassium metabisulfite was used as a sulfur dioxide surrogate