Catalytic Lactonization of Unactivated Aryl C–H Bonds with CO2: Experimental and Computational Investigation
摘要:
The first catalytic lactonization of unactivated aryl C-H bonds with CO2 to afford important phthalides is reported. Notably, this method features high selectivity, excellent functional group tolerance, smooth scalability, and facile product diversification. DFT calculations reveal that a novel insertion of two CO2 into the O-Pd bond of a palladacycle might be the key step, providing great potential and a different perspective for carbonylation with CO2.
Palladium- and Nickel-Catalyzed Cross-Couplings of Unsaturated Halides Bearing Relatively Acidic Protons with Organozinc Reagents
作者:Georg Manolikakes、Carmen Muñoz Hernandez、Matthias A. Schade、Albrecht Metzger、Paul Knochel
DOI:10.1021/jo8015852
日期:2008.11.7
aryl, heteroaryl, alkyl, and benzylic zinc reagents were coupled with unsaturated aryl halides bearing an acidic NH or OH proton, using Pd(OAc)2 (1 mol %) and S-Phos (2 mol %) as catalyst without the need of protecting groups. A similar nickel-catalyzed reaction is described. The relative kinetic basicity of organozinc compounds as well as their stability toward acidic protons is also described.
Negishi Cross-Couplings of Unsaturated Halides Bearing Relatively Acidic Hydrogen Atoms with Organozinc Reagents
作者:Georg Manolikakes、Matthias A. Schade、Carmen Muñoz Hernandez、Herbert Mayr、Paul Knochel
DOI:10.1021/ol8009013
日期:2008.7.3
A wide range of polyfunctional aryl, heteroaryl, alkyl, and benzylic zinc reagents were coupled with unsaturated halides bearing an acidic NH or OH function, using Pd(OAc)(2) (1 mol %) and S-Phos (2 mol %) as catalyst without the need of protecting groups.