I2/K2S2O8-Promoted ring-opening cyclizations of benzothiazoles and 3-oxo-3-arylpropanenitriles
作者:Xuezhen Li、Jing He、Mingxi Du、Jie Zhang、Yanlong Gu、Luigi Vaccaro、Ping Liu
DOI:10.1016/j.mcat.2021.112051
日期:2022.1
An efficient I2/K2S2O8-promoted ring expansion of benzo[d]thiazole and 3-oxo-3-arylpropanenitrile has been developed. A variety of benzo[d]thiazole derivatives underwent the ring-opening cyclization smoothly to afford the diverse 3-aryl-4H-benzo[b][1,4]thiazine-2-carbonitriles in moderate to excellent yields. This protocol features metal-free reaction conditions, stable and available starting materials
已开发出有效的 I 2 /K 2 S 2 O 8促进的苯并[ d ]噻唑和 3-氧代-3-芳基丙腈的扩环。多种苯并[ d ] 噻唑衍生物顺利地进行开环环化,以中等至优异的产率得到不同的3-芳基-4 H-苯并[ b ][1,4]噻嗪-2-甲腈。该协议具有无金属反应条件、稳定可用的起始材料和良好的基团耐受性。该协议的合成效用也通过克级反应和产品衍生化得到了证明。机理研究表明,该反应可能经历自由基过程。