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
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
Regioselective formation of 2,5-disubstituted furan-3-carboxylates and the isomeric 2,4-disubstituted furan-3-carboxylates from the same substrates was realized under different reaction condition.