Palladium-Catalyzed Direct Arylations of 1,2,3-Triazoles with Aryl Chlorides using Conventional Heating
作者:Lutz Ackermann、Rubén Vicente、Robert Born
DOI:10.1002/adsc.200800016
日期:2008.3.25
Generally applicable, palladium-catalyzeddirectarylations of 1,2,3-triazoles with aryl chlorides were accomplished through conventional heating at reaction temperatures of 105–120 °C. Thereby, intra- and intermolecular CH bond functionalizations were achieved with a variety of differently substituted chlorides as electrophiles, bearing numerous valuable functional groups.
Pd(OAc)(2)-catalyzed regioselective C(5)-H arylation of 1,4-disubstituted 1,2,3-triazoles was achieved without ligand under microwave conditions in 1h, generating 1,4,5-trisubstituted 1,2,3-triazoles with good to excellent yields. The obtained molecules can be easily converted into 4,5-disubstituted 1,2,3-triazoles through the debenzylation process with one-pot manipulation.[GRAPHICS].