Synthesis of carbonylated heteroaromatic compounds via visible-light-driven intramolecular decarboxylative cyclization of o-alkynylated carboxylic acids
An efficient strategy for the easy access to carbonylated heteroaromatic compounds has been developed via a visible-light-promoted intramolecular decarboxylative cyclization reaction of o-alkynylated carboxylic acids. This method is characterized by its benign conditions and the tolerance to a wide range of functionalities.
Cycloaddition of Arynes with Iodonium Ylides: a Mild and General Route for the Synthesis of Benzofuran Derivatives
作者:Xiao-Cheng Huang、Yi-Lin Liu、Yun Liang、Shao-Feng Pi、Feng Wang、Jin-Heng Li
DOI:10.1021/ol800051k
日期:2008.4.1
A mild and general cycloaddition of arynes with iodonium ylides protocol has been developed for the synthesis of benzofurans. In the presence of CsF, ortho-silyl aryltriflates were reacted with iodonium ylides smoothly at room temperature in moderate to good yields.
Gold(III)-Catalyzed Tandem Reaction of<i>O</i>-Arylhydroxylamines with 1,3-Dicarbonyl Compounds: Highly Selective Synthesis of 3-Carbonylated Benzofuran Derivatives
A highly regioselective protocol for the synthesis of 3-carbonylated benzofuran derivatives has been developed involving the gold(III)-catalyzed tandem condensation/rearrangement/cyclization reaction of O-arylhydroxylamines with 1,3-dicarbonyl compounds.
addition cyclization/amidation reaction of 1,6-enynes with nitriles to synthesize 3-enamide-substituted dihydrobenzofurans has been developed. The transformation involves the addition of a Brønsted acid as the electrophilic reagent to enynes, followed by intramolecular cyclization to form cationic intermediates, and the termination of the reaction by a nitrile as a nucleophile. The main features of