Metal-Free Synthesis of 2-Aminobenzothiazoles via Iodine-Catalyzed and Oxygen-Promoted Cascade Reactions of Isothiocyanatobenzenes with Amines
作者:Yuanshuang Xu、Bin Li、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.7b01683
日期:2017.9.15
the cascade reactions of isothiocyanatobenzenes with primary or secondaryamines by using iodine as a catalyst and oxygen as an oxidant is presented. Mechanistically, the formation of the title compounds involves the in situ formation of the required benzothiourea intermediate followed by its intramolecular cross dehydrogenativecoupling of a C(sp2)–H bond and a S–H bond. To our knowledge, this should
The 1,10-phenanthroline-catalyzedtandemreaction of 2-iodoaniline with isothiocyanate in water is described, which provides an environmentally benign, efficient and simple route for the preparation of 2-aminobenzothiazoles. The present tandem process shows broad substrate scope in the absence of transition metals and phase-transfer catalysts.
Synthesis of<i>N</i>-Substituted-2-Aminobenzothiazoles by Ligand-Free Copper(I)-Catalyzed Cross-Coupling Reaction of 2-Haloanilines with Isothiocyanates
This study reports a new synthetic approach leading to N-arylbenzo[d]thiazol-2-amine derivatives. Our synthetic method involves a S-alkylation reaction of various benzo[d]thiazole-2-thiols and 2-chloro-N-arylacetamides and a subsequent fragmentation step via Smiles rearrangement. This synthetic procedure is widely applicable, affords the N-arylbenzo[d]thiazol-2-amine derivatives in good to excellent
这项研究报道了一种新的合成方法,可产生N-芳基苯并[ d ]噻唑-2-胺衍生物。 我们的合成方法涉及各种苯并[ d ]噻唑-2-硫醇和 2-氯-N-芳基乙酰胺的S-烷基化反应以及随后通过Smiles重排进行的断裂步骤。该合成方法应用广泛,以良好至优异的收率提供N-芳基苯并[ d ]噻唑-2-胺衍生物,并且在温和条件下使用无毒且较便宜的化学品。