2,4,6-Triphenylpyridine as a neutral leaving group in the palladium(0)-catalyzed allylation of nucleophiles
作者:M. Moreno-Mañas、L. Mortal、R. Pleixats
DOI:10.1002/jhet.5570340136
日期:1997.1
Palladium(0)-catalyzedallylation of nucleophiles such as morpholine, sodium dimethyl malonate and 2,6-dimethylaniline can be achieved under very mild conditions using N-allyl-2,4,6-triphenylpyridinium tetrafluoroborates as allylating reagents in reactions in which 2,4,6-triphenylpyridine acts as the neutral leaving group.
efficient bench-stable catalysts for the oligomerization of ethylenes. Herein, their further application was developed in the catalytic transformation of N,N-diallylanilines to pyrrolidines through a cycloisomerization process. In this protocol, chlorobenzene is a vital additive to promote reaction efficiency. Cobalt catalysts bearing 2-imino-1,10-phenanthroline ligands are quite efficient bench-stable catalysts
Assisted tandem catalytic RCM-aromatization in the synthesis of pyrroles and furans
作者:Bernd Schmidt、Stefan Krehl、Eric Jablowski
DOI:10.1039/c2ob25543j
日期:——
An assisted tandem catalytic transformation of diallyl amines and diallyl ethers into N-aryl pyrroles and furans, respectively, is described. The sequence relies on ring closing metathesis followed by dehydrogenation of the initially formed dihydropyrroles and dihydrofurans. Both steps are Ru-catalyzed, but the sequence requires only one precatalyst, because conversion of the metathesis catalyst into
Synthesis of Pyrrole Derivatives from Diallylamines by One-Pot Tandem Ring-Closing Metathesis and Metal-Catalyzed Oxidative Dehydrogenation
作者:Weiqiang Chen、Jianhui Wang
DOI:10.1021/om400046r
日期:2013.3.25
A series of aryl-substituted pyrrole derivatives was synthesized from diallylamines through a ruthenium carbene catalyzed ring-closingmetathesis reaction and in situ oxidative dehydrogenation reaction catalyzed by FeCl3·6H2O or CuCl2·2H2O in the presence of O2. The reaction was mild, simple, and convenient. An oxygen atmosphere played a critical role in obtaining high conversion of substituted pyrroles