Functionalization of C sp 3H and C sp 2H Bonds: Synthesis of Spiroindenes by Enolate-Directed Ruthenium-Catalyzed Oxidative Annulation of Alkynes with 2-Aryl-1,3-dicarbonyl Compounds
作者:Suresh Reddy Chidipudi、Imtiaz Khan、Hon Wai Lam
DOI:10.1002/anie.201207170
日期:2012.11.26
Ru(de) awakening: The synthesis of carbocycles by the ruthenium‐catalyzedoxidativeannulation of alkynes with 2‐aryl cyclic 1,3‐dicarbonyl substrates is described. Proceeding by the functionalization of CH and CH bonds, and the formation of an all‐carbon quaternary center, the reaction provides a diverse range of spiroindenes in good yields with high levels of regioselectivity.
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.
Palladium-catalyzed double C–H functionalization of 2-aryl-1,3-dicarbonyl compounds: a facile access to alkenylated benzopyrans
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.