p-Toluenesulfonic acid mediated hydroarylation of cinnamic acids with anisoles and phenols under metal and solvent-free conditions
作者:Arun R. Jagdale、Arumugam Sudalai
DOI:10.1016/j.tetlet.2007.05.059
日期:2007.7
Hydroarylation of cinnamic acids with anisoles and phenols mediated by p-toluenesulfonic acid (p-TSA) under metal and solvent-free conditions gave 3-(4-methoxyphenyl)-3-phenylpropanoic acids and dihydrocoumarins, respectively, in high yields and excellent selectivity.
Solvent-free synthesis of 4-aryl-3,4-dihydrobenzopyran-2-ones via [3+3] cyclocoupling of phenols with cinnamic acid catalyzed by molecular iodine
作者:Durga P. Kamat、Santosh G. Tilve、Vijayendra P. Kamat
DOI:10.1016/j.tetlet.2012.06.069
日期:2012.8
Molecular iodine was used as a catalyst in the [3+3] cyclocoupling of phenols and cinnamicacids which proceeds via a tandem esterification–hydroarylation process at 120–130 °C under solvent-free conditions. Substituted 4-aryl-3,4-dihydrobenzopyran-2-ones were obtained in good yields.
Palladium Catalyzed Enantioselective Hayashi–Miyaura Reaction for Pharmaceutically Important 4-Aryl-3,4-dihydrocoumarins
作者:Jixing Lai、Chen Yang、René Csuk、Baoan Song、Shengkun Li
DOI:10.1021/acs.orglett.1c04366
日期:2022.2.18
The first palladium-catalyzed asymmetric addition of arylboronic acids to coumarins was successfully established, providing a straightforward asymmetric approach to achieving pharmaceutically important 4-aryl-3,4-dihydrocoumarins. This methodology features easily accessible and bench-stable ligands, a wide substrate scope, mild conditions, and accommodation of electron-withdrawing arylboronic acids
Single-step synthesis of 4-phenyl and 3,4-dihydro-4-phenyl coumarins using a recyclable Preyssler heteropolyacid catalyst under solvent-free reaction conditions
作者:Angélica M. Escobar、Diego M. Ruiz、Juan C. Autino、Gustavo P. Romanelli
DOI:10.1007/s11164-015-2016-3
日期:2015.12
4-Phenyl and 3,4-dihydro-4-phenylcoumarins were prepared by direct esterification of phenols with phenylpropiolic and cinnamic acids, respectively, using a compound with Preyssler structure (H14P5NaW30O110) (PA) as heterogeneous catalyst under solvent-free reaction conditions, at 130 °C, in a short reaction time (2 h). Under these conditions, very good yields (11 examples: 61 %–90 %), free of secondary products, were obtained. The catalyst is recyclable, nontoxic, neither air nor moisture sensitive, and easy to handle. The described methodology is a clean and useful alternative to synthesize oxygenated heterocycles based on a coumarin skeleton.
Microwave-Assisted One-Pot Synthesis of Dihydrocoumarins from Phenols and Cinnamoyl Chloride
作者:Yuan Ma、Zhen Zhang、Yufen Zhao
DOI:10.1055/s-2008-1042921
日期:——
A facile approach has been developed for the synthesis of dihydrocoumarin derivatives through the reaction of phenols and cinnamoyl chloride in the presence of ecofriendly solid-acid catalyst montmorillonite K-10 via a tandem esterification-Friedel-Crafts alkylation process under microwave irradiation. The catalyst could be easily recovered and recycled.