Iodo- and bromo-enolcyclization of 2-(2-propenyl)cyclohexanediones and 2-(2-propenyl)cyclohexenone derivatives using iodine in methanol and pyridinium hydrobromide perbromide in dichloromethane
Iodo- and bromo-enolcyclization of 2-(2-propenyl)cyclohexanediones and 2-(2-propenyl)cyclohexenone derivatives using iodine in methanol and pyridinium hydrobromide perbromide in dichloromethane
Facile Construction of the Benzofuran and Chromene Ring Systems via Pd<sup>II</sup>-Catalyzed Oxidative Cyclization
作者:So Won Youn、Jeong Im Eom
DOI:10.1021/ol051264z
日期:2005.7.1
text]. We herein report the development of one-pot procedures for the conversion of allyl aryl ethers to 2-methylbenzofurans (via sequential Claisenrearrangement and oxidative cyclization) and for the conversion of aryl homoallyl ethers to chromenes (via direct oxidative cyclization). It is likely that both reactions proceed via a common Pd-catalyzed pathway involving olefin activation, nucleophilic
Highly efficient Wackeroxidation of aromatic or aliphatic terminalalkenes into methyl ketones and benzofurans is developed by using reusable Pd0 nanoparticles (NPs) supported on ZrO2 underacid‐ and cocatalyst‐freeconditions. Molecular oxygen or air can be utilized as the terminal oxidant, which results in the formation of H2O as the only theoretical byproduct. The activation of the Pd NPs by O2 plays
Synthesis of dihydrobenzo[b]furans by diastereoselective acyloxyarylation
作者:Kazuhiro Hata、Zhiheng He、Constantin Gabriel Daniliuc、Kenichiro Itami、Armido Studer
DOI:10.1039/c3cc47350c
日期:——
A highly diastereoselective synthesis of 2-aryl-3-acyloxy-2,3-dihydrobenzofurans by palladium-catalyzed acyloxyarylation involving dearomatization of benzofurans with arylboronic acids and carboxylic acids occurring under mild conditions has been developed.
Nucleophilic Aromatic Substitution on Tricarbonylchromium-complexed Haloarenes: Synthesis of<i>O</i>-Aryloximes and Their Cyclization to Benzofurans
作者:Andreina Alemagna、Clara Baldoli、Paola Del Buttero、Emanuela Licandro、Stefano Maiorana
DOI:10.1055/s-1987-27888
日期:——
A series of O-aryloximes have been prepared from tricarbonylchromium-complexed haloarenes in mild conditions. Title compounds are starting materials for benzofuran synthesis.