Selective construction of 2-substituted benzothiazoles from o-iodoaniline derivatives S8 and N-tosylhydrazone via a copper-promoted [3 + 1 + 1]-type cyclization reaction has been realized. In the protocol, the carbon atom on N-tosylhydrazone could be regulated to construct benzothiazole by changing the reaction system. Furthermore, the transformation has achieved the construction of multiple carbon-heteroatom
Photoredox-Mediated Direct Cross-Dehydrogenative Coupling of Heteroarenes and Amines
作者:Jianyang Dong、Qing Xia、Xueli Lv、Changcun Yan、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.8b02389
日期:2018.9.21
A photoredox-mediated direct cross-dehydrogenativecouplingreaction to accomplish α-aminoalkylation of N-heteroarenes is reported. This mild reaction has a broad substrate scope, offers the first general method for synthesis of aminoalkylated N-heteroarenes without the need for substrate prefunctionalization, and is scalable to the gram level. Furthermore, the reaction was found to be applicable to
benzothiazole derivatives in high yields was provided via copper catalyzed tandem cyclization with o-haloanilines, elemental sulfur and terminal alkynes as raw materials. In this protocol, C atoms on the CC triplebond were controllably involved in the construction of the benzothiazole framework and multiple carbon–heteroatom bonds through divergent routes.
S8-Mediated Cyclization of Bis(2-aminophenyl) Disulfide/Diselenide with Arylacetylenes/Styrenes: Access to 2-(Arylmethyl)-1,3-benzothiazoles/benzoselenazoles
作者:Hongli Wu、Haifeng Gan、Caojian Feng、Lihuan Zhao、Mengru Cao
DOI:10.1055/a-1665-8562
日期:2022.1
A novel S8-mediatedapproach to benzothiazoles/benzoselenazoles from bis(2-aminophenyl) disulfides/diselenides and phenylacetylenes or styrenes has been developed. 2-(Arylmethyl)-1,3-benzoselenazoles were comprehensively synthesized for the first time. The reactions proceeded in moderate to excellent yields, and with a gram-scale application.