Molecular iodine-mediated synthesis of thiocarbamates from thiols, isocyanides and water under metal-free conditions
作者:Wen-Hu Bao、Chao Wu、Jing-Ting Wang、Wen Xia、Ping Chen、Zilong Tang、Xinhua Xu、Wei-Min He
DOI:10.1039/c8ob01820k
日期:——
A metal-free and efficient molecular iodine-mediated protocol has been developed to prepare thiocarbamates from readily available thiols, isocyanides and water.
已开发出一种无金属、高效的分子碘介导的方法,可从易得的硫醇、异氰酸酯和水中制备硫代氨基甲酸酯。
Iodine-catalyzed formation of substituted 2-aminobenzothiazole derivatives in PEG<sub>400</sub>
An iodine-catalyzed formation of substituted 2-aminobenzothiazole derivatives is herein described using hydrogen peroxide as an oxidant in PEG400. The method enabled an efficient environmentally sound access to this valuable scaffold in moderate to excellent yields under metal-free conditions.
Process for the manufacture of 2-amino-aryleno-thiazole compounds and of
申请人:Hoechst Aktiengesellschaft
公开号:US04252963A1
公开(公告)日:1981-02-24
2-Amino-aryleno-thiazoles in which the amino group in 2-position can be substituted by aryl, alkyl and/or cycloalkyl, and 2-imino-aryleno-thiazolines substituted at the ring nitrogen by aryl, alkyl or cycloalkyl are produced by cyclization of arylthioureas carrying corresponding substituents at the respective nitrogen atom, using thionyl chloride as cyclization agent. The advantage of the improved process resides in that the amount of sulfur formed is very low and that the other by-products are easy to separate and can be used further. The thiazoles and thiazolines are obtained in a high yield and purity. They are valuable starting compounds, especially for the manufacture of dyestuffs.
Cobalt-Catalyzed Oxidative Isocyanide Insertion to Amine-Based Bisnucleophiles: Diverse Synthesis of Substituted 2-Aminobenzimidazoles, 2-Aminobenzothiazoles, and 2-Aminobenzoxazoles
作者:Tong-Hao Zhu、Shun-Yi Wang、Gao-Nan Wang、Shun-Jun Ji
DOI:10.1002/chem.201300239
日期:2013.5.3
Cobalt catalysis: Synthesis of substituted 2‐aminobenzimidazoles, 2‐aminobenzothiazoles, and 2‐aminobenzoxazoles was achieved by using cobalt(II) acetate catalyzed isocyanideinsertion to o‐diaminobenzene, 2‐aminobenzenethiol, and 2‐aminophenol derivatives in 1,4‐dioxane (see scheme). It was found that the reaction proceeded efficiently to give the desired products in up to 95 % isolated yields by
The synthesis of substituted benzimidazoles, 2-aminobenzimidazoles, 2-aminobenzothiazoles, and benzoxazoles is described via intramolecularcyclization of o-bromoaryl derivatives using copper(II) oxide nanoparticles in DMSO under air. The procedure is experimentally simple, general, efficient, and free from addition of external chelating ligands. It is a heterogeneous process and the copper(II) oxide