Convenient synthesis of 2-alkynylbenzazoles through Sonogashira cross-coupling reaction between thioethers and terminal alkynes
作者:Anca Paun、Mihaela Matache、Florina Enache、Ioana Nicolau、Codruta C. Paraschivescu、Petre Ionita、Irina Zarafu、Vasile I. Parvulescu、Gérald Guillaumet
DOI:10.1016/j.tetlet.2015.08.001
日期:2015.9
We describe herein the synthesis of 2-alkynylbenzoxazole and 2-alkynylbenzothiazole derivatives through the Sonogashira cross-coupling reaction of the corresponding thioethers and terminal alkynes under aerobic conditions, using CuI and Pd(dppf)Cl2 as catalysts. The synthetic methodology allows the convenient cross-coupling of heteroaromatic substrates with a wide variety of aromatic and aliphatic
Palladium-Catalyzed Direct C–H Bond Alkynylations of Heteroarenes Using <i>gem</i>-Dichloroalkenes
作者:Lutz Ackermann、Christoph Kornhaass、Yingjun Zhu
DOI:10.1021/ol300514d
日期:2012.4.6
Palladium-catalyzed direct alkynylations of heteroarenes were accomplished with inexpensive gem-dichloroalkenes as user-friendly electrophiles, which set the stage for a modular, step-economical synthesis of diversely decorated heteroaryl alkynes with ample scope.