A simple and efficient copper-catalyzed method has been developed for synthesis of bicyclic pyrimidinones containing six-, seven-, eight-membered rings undermildconditions. The protocol uses readily available 2-bromocycloalk-1-enecarboxylic ac- , ids, amidines, and guanidines as the starting materials, copper-catalyzed cascade couplings provide the corresponding bicyclic pyrimidinones without addition
Fe<sub>3</sub>O<sub>4</sub>nanoparticle-supported copper(I): magnetically recoverable and reusable catalyst for the synthesis of quinazolinones and bicyclic pyrimidinones
作者:Lin Yu、Min Wang、Pinhua Li、Lei Wang
DOI:10.1002/aoc.2902
日期:2012.11
A highly efficient, easily recoverable and reusable Fe3O4 magnetic nanoparticle‐supported Cu(I) catalyst has been developed for the synthesis of quinazolinones and bicyclicpyrimidinones. In the presence of supported Cu(I) catalyst (10 mol%), amidines reacted with substituted 2‐halobenzoic acids and 2‐bromocycloalk‐1‐enecarboxylic acids to generate the corresponding N‐heterocycle products in good to
Intermolecular C–O addition of carboxylic acids to arynes: synthesis of o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones
作者:Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1016/j.tet.2013.01.078
日期:2013.4
An efficient and simple route to biologically and pharmaceutically important o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones has been developed utilizing readily available carboxylic acids and commercially available o-(trimethylsilyl)aryl triflates.
Microwave-Assisted Copper-Powder-Catalyzed Coupling and Cyclization of β-Bromo-α,β-unsaturated Carboxylic Acids with 1,3-Diketones Leading to 2H-Pyran-2-ones
作者:Chan Cho、Son Ho、Ho-Sang Sohn
DOI:10.1055/s-0034-1379103
日期:——
Abstract β-Bromo-α,β-unsaturatedcarboxylicacids were coupled and cyclized with 1,3-diketones by microwave irradiation in the presence of a catalytic amount of copper powder and base to give the corresponding 2H-pyran-2-ones in good to high yields. β-Bromo-α,β-unsaturatedcarboxylicacids were coupled and cyclized with 1,3-diketones by microwave irradiation in the presence of a catalytic amount of
A general strategy for visible-light decaging based on the quinone <i>cis</i>-alkenyl lock
作者:David P. Walton、Dennis A. Dougherty
DOI:10.1039/c9cc01073d
日期:——
Combining the fast thermal cyclization of o-coumaric acid derivatives with the intramolecular photoreduction of quinones gives new visible-light photoremovable protecting groups absorbing well above 450 nm.