Synthesis of Bisquinolone-Based Mono- and Diphosphine Ligands of the Aza-BINAP Type
摘要:
Mono- and bisphosphine ligands based on the 4,4'-bisquinolone structural framework (BIQUIP ligands) were generated by direct microwave-assisted palladium-catalyzed carbon-phosphorus cross-coupling reactions employing the corresponding heteroaryl bromides and diphenylphosphine as substrates.
Synthesis of Symmetrical Bisquinolonesvia Nickel(0)-Catalyzed Homocoupling of 4-Chloroquinolones
作者:Jamshed Hashim、C. Oliver Kappe
DOI:10.1002/adsc.200700081
日期:2007.10.8
preparation of functionalized 4,4′-bisquinolones using a microwave-assisted Ullmann-type homocoupling reaction is described. The method is catalytic in nickel(0) which is generated in situ by reduction from an inexpensive nickel(II) source and utilizes readily available 4-chloroquinolin-2(1H)-ones as starting materials. In contrast to the alternative palladium(0)-catalyzed one-pot borylation/Suzuki cross-coupling