A facile protocol for copper‐free palladium‐catalyzed Sonogashira coupling in aqueous media
作者:Da‐Young Jung、Soo Youl Park、Seung‐Hoi Kim
DOI:10.1002/bkcs.12432
日期:2022.1
combination of a readily available palladiumcatalyst and an eco-friendly basic aqueous solution of room-temperature ionic liquid, choline hydroxide (ChOH), was used in a facile protocol alternative to the Sonogashiracoupling reaction, alkynylation of aryl halides in the absence of a copper cocatalyst and an external base. The dual nature of ChOH to act as a base and a green solvent played a crucial role in
Palladium-Catalyzed Oxidative Cross-Coupling between Heterocycles and Terminal Alkynes with Low Catalyst Loading
作者:Xiaoming Jie、Yaping Shang、Peng Hu、Weiping Su
DOI:10.1002/anie.201210013
日期:2013.3.25
Direct: With [Pd2(dba)3] as a catalyst, the direct alkynylation of thiophenes bearing a variety of substituents has been accomplished by using terminal alkynes as alkynylating reagents. This protocol is also applicable to other electron‐rich aromatic heterocycles. dba=dibenzylidenacetone.
Synthesis of functionalized thiophenes and oligothiophenes by selective and iterative cross-coupling reactions using indium organometallics
作者:M. Montserrat Martínez、Miguel Peña-López、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1039/c2ob25123j
日期:——
The synthesis of unsymmetrical 2,5-disubstituted thiophenes by selective and sequential palladium-catalyzed cross-couplingreactions of indiumorganometallics with 2,5-dibromothiophene is reported. Following an iterative coupling sequence, α-oligothiophenes were synthesized in good yields and with high atom economy.