Synthesis of <i>Ortho</i>/<i>Ortho</i>′-Substituted 1,1-Diarylethylenes through Cross-Coupling Reactions of Sterically Encumbered Hydrazones and Aryl Halides
作者:Maxime Roche、Abdallah Hamze、Olivier Provot、Jean-Daniel Brion、Mouad Alami
DOI:10.1021/jo3023268
日期:2013.1.18
ortho/ortho′-substituents on the aromatic ring with various ortho-, meta-, and para-substituted aryl halides 3 was investigated. To accomplish successfully this challenging coupling, fine-tuning of the reaction conditions were required. The newly established PdCl2(MeCN)2/Xphos/NaO-t-Bu/F-benzene system in a sealed tube is compatible with a broad spectrum of both coupling partners, regardless of their electronic
的空间位的反应性受阻Ñ -tosylhydrazones 2设有邻/邻'与各芳环上的-取代基的邻位- ,间位-和对位-取代的芳基卤化物3进行了研究。为了成功完成这一具有挑战性的偶联,需要对反应条件进行微调。新建立的PdCl 2(MeCN)2 / Xphos / NaO- t密封管中的-Bu / F-苯系统可与多种偶合伙伴兼容,无论它们的电子和位阻性质如何。该方案已成功应用于applied吨衍生物的合成。