Pyridazine derivatives. Part 33: Sonogashira approaches in the synthesis of 5-substituted-6-phenyl-3(2H)-pyridazinones
作者:Alberto Coelho、Eddy Sotelo、Enrique Raviña
DOI:10.1016/s0040-4020(03)00263-1
日期:2003.3
Several 6-phenyl-3(2H)-pyridazinones bearing different alkynyl groups at position 5 have been prepared by a palladium-catalysed Sonogashira cross-coupling reaction. An interesting base-promoted electronically permitted isomerization has been observed during the coupling of 1-phenyl-2-propyn-1-ol. This rearrangement afforded the E-chalcone 6 in excellent yield.
通过钯催化的Sonogashira交叉偶联反应已经制备了几种在5位带有不同炔基的6-苯基-3(2 H)-哒嗪酮。在1-苯基-2-丙炔-1-醇的偶联过程中,观察到了一种有趣的碱促进的电子允许的异构化反应。这种重排以优异的产率提供了E-查耳酮6。