Synthesis and absorption spectral properties of substituted phenylfurylbenzothiazoles and their vinylogues
摘要:
A number of substituted 2-(5-aryl-2-furyl)benzothiazoles and their vinylogues were synthesized from corresponding 5-arylfurfurals by convenient methods. The yields of products and their UV/Vis spectroscopic properties are substituent-dependent.
Phosphine-Free Palladium Catalytic System for the Selective Direct Arylation of Furans or Thiophenes bearing Alkenes and Inhibition of Heck-Type Reaction
作者:Lu Chen、Julien Roger、Christian Bruneau、Pierre H. Dixneuf、Henri Doucet
DOI:10.1002/adsc.201100193
日期:2011.10
Palladium acetate associated to potassium carbonate as catalyticsystem has been found to efficiently catalyse the direct 5-arylation of furans or thiophenesbearing enal, enone or acrylate functions at carbon C-2, and to inhibit the Heck-typereaction. The nature of the base is crucial to control the selectivity of the arylation. In the presence of electron-deficient aryl bromides and potassium carbonate