Oxidant/Solvent-Controlled I2-Catalyzed Domino Annulation for Selective Synthesis of 2-Aroylbenzothiazoles and 2-Arylbenzothiazoles under Metal-Free Conditions

被引:21
作者
Ma, Renchao [1 ,2 ]
Ding, Yuxin [1 ,2 ]
Chen, Rener [1 ,2 ]
Wang, Zhiming [1 ,2 ]
Wang, Lei [1 ,2 ]
Ma, Yongmin [1 ,2 ]
机构
[1] Taizhou Univ, Inst Adv Studies, Taizhou 318000, Peoples R China
[2] Taizhou Univ, Sch Pharmaceut & Chem Engn, Taizhou 318000, Peoples R China
关键词
ONE-POT SYNTHESIS; OXIDATIVE SYNTHESIS; 2-SUBSTITUTED BENZIMIDAZOLES; SUBSTITUTED BENZOTHIAZOLES; ARYL KETONES; EFFICIENT; CYCLIZATION; ACCESS; MILD; ACID;
D O I
10.1021/acs.joc.0c02095
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A simple and practical domino protocol for the selective synthesis of 2-aroylbenzothiazoles and 2-aryl benzothiazoles catalyzed by I-2 is developed under metal-free conditions. The reaction outcomes are exclusively controlled by the reaction oxidant/medium. With DMSO employed as both the solvent and the oxidant, an oxidation of aromatic methyl ketones takes precedence over the condensation with 2-aminobenzenethiols. On the other hand, when the reaction was carried out in PhNO2 or in 1,4-dioxane containing PhNO2, the condensation of aromatic methyl ketones with 2-aminobenzenethiols has priority to form imines which is followed by an oxidation of the methyl group from ketones to afford 2-arylbenzothiazoles as a sole product. The PhNO2/I-2 co-catalytic system is proposed first time.
引用
收藏
页码:310 / 321
页数:12
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