Efficient and Economical Access to Substituted Benzothiazoles: Copper-Catalyzed Coupling of 2-Haloanilides with Metal Sulfides and Subsequent Condensation
Don′t tell azole: The first metal‐catalyzed direct coupling of metalsulfides with aryl halides and subsequent intramolecular condensation provided substitutedbenzothiazoles (see scheme). A wide range of functional groups are tolerated under the reaction conditions.
Fischer,E.; Windaus, Chemische Berichte, 1900, vol. 33, p. 1973
作者:Fischer,E.、Windaus
DOI:——
日期:——
Combined C−H Functionalization/C−N Bond Formation Route to Carbazoles
作者:W. C. Peter Tsang、Nan Zheng、Stephen L. Buchwald
DOI:10.1021/ja055353i
日期:2005.10.1
A new method in which a series of substituted carbazoles is efficiently produced by the combination of an amide and an arene is described. The key feature of this method is the palladium-catalyzed tandem directed C-H functionalization and amide arylation. The method tolerates substitution on either ring of the biaryl amide substrates, and the products can be assembled in a simple two-step protocol from readily available reagents. The Pd(0) species generated are reoxidized to Pd(II) in the presence of Cu(OAc)2 and an atmosphere of oxygen.
Transition-Metal-Free Synthesis of Benzimidazoles Mediated by KOH/DMSO
作者:Hannah Baars、Astrid Beyer、Stefanie V. Kohlhepp、Carsten Bolm
DOI:10.1021/ol403414v
日期:2014.1.17
Benzimidazoles are prepared by intramolecular N-arylations of amidines mediated by potassium hydroxide in DMSO at 120 degrees C. In this manner, diversely substituted products have been obtained in moderate to very good yields.
A Palladium-Catalyzed Regiospecific Synthesis ofN-Aryl Benzimidazoles
作者:Nan Zheng、Kevin W. Anderson、Xiaohua Huang、Hanh Nho Nguyen、Stephen L. Buchwald