Palladium-catalyzed coupling of N-tosylhydrazones with ortho substituted aryl halides: synthesis of 4-arylchromenes and related heterocycles
作者:Evelia Rasolofonjatovo、Bret Tréguier、Olivier Provot、Abdallah Hamze、Estelle Morvan、Jean-Daniel Brion、Mouad Alami
DOI:10.1016/j.tetlet.2010.12.093
日期:2011.3
A convenient and efficient procedure for the synthesis of 4-arylchromenes, thiochromenes, and related heterocycles via a four step-sequence has been developed. The first three steps, which involve hydration of alkynes, hydrazones formation, and their Pd-coupling with ortho substituted aryl halides, furnished stereoselectively Z-trisubstituted olefins without any purification of the intermediates generated
已经开发了通过四个步骤序列合成4-芳基色烯,硫代色烯和相关杂环的方便和有效的方法。前三个步骤涉及炔烃的水合,的形成以及它们与邻位取代的芳基卤化物的Pd偶联,提供了立体选择性的Z-三取代的烯烃,而没有纯化每个阶段中产生的中间体。在最后的步骤中,证明后者是合适的前体,用于合成具有生物学意义的所需杂环。