Reaction of Alkynes and Azides: Not Triazoles Through Copper-Acetylides but Oxazoles Through Copper-Nitrene Intermediates
作者:Estela Haldón、Maria Besora、Israel Cano、Xacobe C. Cambeiro、Miquel A. Pericàs、Feliu Maseras、M. Carmen Nicasio、Pedro J. Pérez
DOI:10.1002/chem.201303737
日期:2014.3.17
Well‐defined copper(I) complexes of composition [Tpm*,BrCu(NCMe)]BF4 (Tpm*,Br=tris(3,5‐dimethyl‐4‐bromo‐pyrazolyl)methane) or [Tpa*Cu]PF6 (Tpa*=tris(3,5‐dimethyl‐pyrazolylmethyl)amine) catalyze the formation of 2,5‐disubstituted oxazoles from carbonyl azides and terminal alkynes in a direct manner. This process represents a novel procedure for the synthesis of this valuable heterocycle from readily
A highly efficient palladium-catalyzed desulfitative arylation of azoles with sodium arylsulfinates
作者:Min Wang、Dengke Li、Wei Zhou、Lei Wang
DOI:10.1016/j.tet.2011.12.072
日期:2012.2
A highly efficient palladium-catalyzed direct desulfitative arylation of azoles at C2-position has been developed using sodium arylsulfinates as aryl sources. Azoles including benzoxazoles, benzothiazoles, oxazoles, thiazoles, and 1,3,4-oxadiazoles reacted with sodium arylsulfinates smoothly to generate the corresponding products in good to excellent yields, and various substitution patterns were tolerated