Palladium-catalyzed double C–H functionalization of 2-aryl-1,3-dicarbonyl compounds: a facile access to alkenylated benzopyrans
摘要:
The present study reports the development of a palladium-catalyzed oxidative annulation/nucleophilic substitution sequence affording a library of alkenylated benzopyrans using 2-aryl-1,3-dicarbonyl compounds and allylic acetate. The process is compatible to a wide range of substrates with good functional group tolerance producing the desired heterocycles in moderate to good yields. (C) 2016 Elsevier Ltd. All rights reserved.
developed under redox-neutral ruthenium(II) catalysis, offering a wide variety of valuable 3-aryl succinimides including amino acid embedded frameworks in good to excellent yields. The products were also aromatized to produce synthetically useful resorcinol-based biaryls. Mechanistic studies support an organometallic pathway with a reversible C–H metalation step for this reaction.
在氧化还原中性钌 (II) 催化下开发了一种烯醇辅助的区域选择性芳烃 C-H 与马来酰亚胺的烷基化反应,提供了多种有价值的 3-芳基琥珀酰亚胺,包括氨基酸嵌入框架,收率良好至极佳。产物也被芳构化以产生合成有用的基于间苯二酚的联芳基化合物。机理研究支持有机金属途径与该反应的可逆 C-H 金属化步骤。
Synthesis of Benzopyrans by Pd(II)- or Ru(II)-Catalyzed C–H Alkenylation of 2-Aryl-3-hydroxy-2-cyclohexenones
作者:Suresh Reddy Chidipudi、Martin D. Wieczysty、Imtiaz Khan、Hon Wai Lam
DOI:10.1021/ol3033835
日期:2013.2.1
2-Aryl-3-hydroxy-2-cyclohexenones are shown to be competent substrates for palladium- and ruthenium-catalyzed C-H alkenylation reactions with terminal alkenes, providing, in most cases, benzopyrans.