Double C–S bond formation via C–H bond functionalization: synthesis of benzothiazoles and naphtho[2,1-d]thiazoles from N-substituted arylamines and elemental sulfur
作者:Xiaoming Zhu、Yuzhong Yang、Genhua Xiao、Jianxin Song、Yun Liang、Guobo Deng
DOI:10.1039/c7cc07366f
日期:——
A novel, atom economic, and environmentally friendly method for the synthesis of 2-substituted benzothiazoles and 2-substituted naphtho[2,1-d]yhiazoles from N-substituted arylamines and elemental sulfur has been developed under metal-free conditions. The reaction underwent the process of double C-Sbonds formation through C-H bonds functionalization.
TBHP/KI-Promoted Annulation of Anilines, Ethers, and Elemental Sulfur: Access to 2-Aryl-, 2-Heteroaryl-, or 2-Alkyl-Substituted Benzothiazoles
作者:Jie Zhang、Xin Zhao、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.9b02145
日期:2019.10.4
TBHP/KI-promoted annulation of anilines with ethers and elemental sulfur has been developed through the selective C-O bond cleavage of ethers under transition-metal-free conditions. A wide range of 2-aryl-, 2-heteroaryl-, and 2-alkyl-substituted benzothiazoles were easily prepared with satisfactory yields and good functional group compatibility.
NH<sub>4</sub>I-promoted oxidative formation of benzothiazoles and thiazoles from arylacetic acids and phenylalanines with elemental sulfur
作者:Yujia Xia、Huawen Huang、Wei Hu、Guo-Jun Deng
DOI:10.1039/d1ob00671a
日期:——
NH4I/K3PO4-based catalytic system has been established to enable oxidative formation of thiazole compounds from arylacetic acids and phenylalanines with elemental sulfur. While the three-component reaction of anilines or β-naphthylamines with arylacetic acids and elemental sulfur affords benzo[2,1-d]thiazoles and naphtho[2,1-d]thiazoles, the annulation of phenylalanines with elemental sulfur produces 2-benzyl
已经建立了基于NH 4 I/K 3 PO 4的催化体系,以使得能够从芳基乙酸和苯丙氨酸与元素硫氧化形成噻唑化合物。虽然苯胺或 β-萘胺与芳基乙酸和元素硫的三组分反应产生苯并[ 2,1- d ]噻唑和萘并[ 2,1- d ]噻唑,但苯丙氨酸与元素硫的环化产生 2-苄基和 2-苯甲酰基噻唑。这项工作很好地补充了以前来自其他偶联伙伴的苯并噻唑的三组分环化。
Electrochemical intramolecular dehydrogenative C–S bond formation for the synthesis of benzothiazoles
作者:Pan Wang、Shan Tang、Aiwen Lei
DOI:10.1039/c7gc00468k
日期:——
An external oxidant-free intramolecular dehydrogenative C-S cross-coupling has been developed under undivided electrolytic conditions. Various 2-aminobenzothiazoles could be synthesized with up to 99% yield from the direct combination of aryl...
Riboflavin as Photoredox Catalyst in the Cyclization of Thiobenzanilides: Synthesis of 2-Substituted Benzothiazoles
作者:Lydia M. Bouchet、Adrián A. Heredia、Juan E. Argüello、Luciana C. Schmidt
DOI:10.1021/acs.orglett.9b04384
日期:2020.1.17
Benzothiazoles are synthesized from thiobenzanilides using riboflavin as a photosensitizer and potassium peroxydisulfate as a sacrificial oxidizing agent under visible light irradiation. The methodology accepts a broad range of functional groups and affords the 2-substitutedbenzothiazoles by transition-metal-free organic photoredoxcatalysis under very mild conditions.