Iron catalyzed oxidative assembly of N-heteroaryl and aryl metal reagents using oxygen as an oxidant
作者:Kun Ming Liu、Lian Yan Liao、Xin Fang Duan
DOI:10.1039/c4cc08494b
日期:——
An equivalent amount of N-heteroaryl and aryl Grignard or lithium reagents, after mediation by an equivalent of titanate, was facilely coupled to furnish N-heteroaryl-aryl compounds under the catalysis of FeCl3/TMEDA at ambient temperature usingoxygen as an oxidant. Most of the common N-heteroaryls were all good candidates, and thus provided a general, green and pratical protocol for the flexible
Synthesis of 2-Substituted Benzothiazoles by Visible Light-Driven Photoredox Catalysis
作者:Chunghyeon Yu、Kyungyub Lee、Youngmin You、Eun Jin Cho
DOI:10.1002/adsc.201300376
日期:2013.5.17
An efficient method for synthesis of the widely applicable 2‐substituted benzothiazoles has been developed. The process requires only 0.1 mol% [Ru(bpy)3Cl2], O2, and visible light irradiation with substrates: 2‐aminothiophenol and a variety of aldehydes. We established an oxidative quenching of the photoredox catalyst as being the key process in this photoelectrocatalytic cycle.
Elemental sulfur mediated cyclization via redox strategy: Synthesis of benzothiazoles from o -chloronitrobenzenes and benzyl chlorides
作者:Xin Wang、Dazhuang Miao、Xiaotong Li、Renhe Hu、Zhao Yang、Ren Gu、Shiqing Han
DOI:10.1016/j.tet.2017.07.013
日期:2017.8
A novel metal-free synthesis of 2-substituted benzothiazoles from easily available o-chloronitrobenzenes and benzyl chlorides using elementalsulfur as traceless oxidizing agent has been developed. The protocol provides a simple, efficient, and atom-economic way to access to benzothiazoles in moderate to excellent yields. And the approach exhibited good functional group tolerance.
Efficient 2-Aryl Benzothiazole Formation from Aryl Ketones and 2-Aminobenzenethiols under Metal-Free Conditions
作者:Yunfeng Liao、Hongrui Qi、Shanping Chen、Pengcheng Jiang、Wang Zhou、Guo-Jun Deng
DOI:10.1021/ol302902e
日期:2012.12.7
2-Aryl benzothiazole formationfrom aryl ketones and 2-aminobenzenethiols under metal- and I2-free conditions was described. Various 2-aryl benzothiazoles were selectively obtained in good yields using molecular oxygen as oxidant. DMSO played an important role in this transformation. Functional groups such as methyl, methoxy, fluoro, chloro, bromo and nitro groups were tolerated under the optimized reaction
Photoinduced Copper-Catalyzed C−H Arylation at Room Temperature
作者:Fanzhi Yang、Julian Koeller、Lutz Ackermann
DOI:10.1002/anie.201512027
日期:2016.4.4
Room‐temperature azole C−H arylations were accomplished with inexpensive copper(I) compounds by means of photoinduced catalysis. The expedient copper catalysis set the stage for site‐selective C−H arylations of non‐aromatic oxazolines under mild reaction conditions, and provides step‐economical access to the alkaloid natural products balsoxin and texamine.