Efficient copper-free Pd(OAc)2/Ruphos-catalyzed Sonogashira coupling in the preparation of 3′-hydroxycorfin and gymnopalynes A analogues
摘要:
An efficient method involving copper-free Pd(OAc)(2)/Ruphos-catalyzed Sonogashira coupling strategy for a variety of 3-alkynyl isochromen-1-ones has been developed. Sonogashira coupling in the presence of catalytic system-Pd(OAc)(2)/Ruphos, Et3N base, and tetrahydrofuran solvent under aqueous and room temperature conditions, provided novel 3-(allcynyl)-1H-isochromen-1-ones in excellent yields. The methodology has also been extended toward natural isochromen-1-one-3'-hydroxycorfin and gymnopalynes A analogues. (C) 2014 Elsevier Ltd. All rights reserved.
Palladium/copper-catalyzed tandem Sonogashira coupling/lactonization of methyl 2-(2′,2′-dibromovinyl)benzoate with terminal alkynes: Facile access to 3-alkynyl isocoumarins
作者:Xiaozu Liu、Guojun Chen、Yuxiang Zhou、Peijun Liu
DOI:10.1016/j.tetlet.2018.07.017
日期:2018.8
An efficient palladium/copper-catalyzed tandem Sonogashira reaction/lactonization of methyl2-(2′,2′-dibromovinyl)benzoate with terminal alkynes has been developed. This facile and direct approach furnishes a variety of 3-alkynyl isocoumarins in moderate to good yields under mild reaction conditions. Furthermore, this method enables concise total synthesis of natural products 3′-hydroxycorfin and gymnopalynes