Synthesis of Furan-3-carboxylic and 4-Methylene-4,5-dihydrofuran-3-carboxylic Esters by Direct Palladium Iodide Catalyzed Oxidative Carbonylation of 3-Yne-1,2-diol Derivatives
A variety of 3-yne-1,2-diol derivatives 1, bearing a primary or secondary alcoholic group at C-1, have been efficiently converted into high value added furan-3-carboxylic esters 2 in one step by PdI2/KI-catalyzed directoxidativecarbonylation, carried out in alcoholic media under relatively mild conditions (100 °C under 40 atm of a 4/1 mixture of CO and air). Carbonylated furans 2 were obtained in
Rh(I)‐Catalyzed Decarboxylative Arylation of Alkynyl Cyclic Carbonates: Divergent Access to Substituted
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‐Allenols and 1,3‐Butadienes
作者:Geetanjali S. Sontakke、Rahul K. Shukla、Chandra M. R. Volla
DOI:10.1002/adsc.202101064
日期:2022.2
Rh(I)-catalyzed decarboxylative arylation of alkynyl cyclic carbonates using commercially available and low-toxic aryl boronic acids has been disclosed. Depending on the nature of the cyclic carbonates, the methodology provides a straightforward platform to access either substituted 2,3-allenols or 1,3-butadiene derivatives. Internal alkynyl cyclic carbonates undergo monoarylation to conveniently afford
Design for diversity: A new catalytic system based on PEG‐3400 and a metal salt (Pt or Au) was designed to efficiently perform a cycloisomerization reaction under microwave irradiation, which gave diverse heterocycles in good to excellent yields, after a precipitation/filtration procedure (see scheme).
A simple and convenient synthesis of substituted furans and pyrroles by CuCl2-catalyzed heterocyclodehydration of 3-yne-1,2-diols and N-Boc- or N-tosyl-1-amino-3-yn-2-ols
作者:Bartolo Gabriele、Pierluigi Plastina、Mabel V. Vetere、Lucia Veltri、Raffaella Mancuso、Giuseppe Salerno
DOI:10.1016/j.tetlet.2010.05.001
日期:2010.7
A simple and economical synthesis of substitutedfurans and pyrroles, by ligand-free CuCl2-catalyzed heterocyclodehydration of readily available 3-yne-1,2-diols and N-Boc- or N-tosyl-1-amino-3-yn-2-ols, respectively, is presented. Reactions are carried out in MeOH at 80–100 °C for 1–24 h and afford the corresponding heterocyclic derivatives in 53–99% isolated yields.
Palladium-catalyzed oxidative heterocyclodehydration-alkoxycarbonylation of 3-yne-1,2-diols: a novel and expedient approach to furan-3-carboxylic esters
作者:Bartolo Gabriele、Lucia Veltri、Raffaella Mancuso、Pierluigi Plastina、Giuseppe Salerno、Mirco Costa
DOI:10.1016/j.tetlet.2010.01.054
日期:2010.3
furan-3-carboxylic esters 2 is presented, based on palladium-catalyzeddirect oxidative carbonylation of readily available 3-yne-1,2-diols 1. The process, corresponding to a sequential combination between a 5-endo-dig heterocyclodehydration step and an oxidative alkoxycarbonylation stage, is catalyzed by PdI2 in conjunction with an excess of KI under relatively mild conditions (100 °C in ROH under 40 atm