Recyclable Selective Palladium-Catalyzed Synthesis of Five-, Six- or Seven-Membered Ring Lactones and Lactams by Cyclocarbonylation in Ionic Liquids
作者:Fangguo Ye、Howard Alper
DOI:10.1002/adsc.200606100
日期:2006.9
ionic liquids, BMIMPF6 or BMIM NTf2, are used successfully for the palladium-catalyzed cyclocarbonylation of 2-allylphenols and anilines, 2-vinylphenols, and 2-aminostyrenes. The reaction proceeds cleanly and efficiently to afford high yields of lactones or lactams with good or excellent selectivity for one isomer. The ionic liquid containing the palladium catalyst, and ligand, is recyclable in all cases
Transition-metal-catalyzed hydroformylation has become an essential tool for the synthesis of aldehydes. In this paper, we highlight several examples of synthetically useful applications of homogeneous and heterogeneous rhodium-catalyzed hydroformylation, as well as several examples of tandem processes involving hydroformylation as a reaction step developed in our laboratory.
Rhodium(i)-catalyzed hydroaminomethylation of 2-isopropenylanilines as a novel route to 1,2,3,4-tetrahydroquinolines
作者:Tiago O. Vieira、Howard Alper
DOI:10.1039/b702497e
日期:——
A new atom economical approach for the preparation of 1,2,3,4-tetrahydroquinolines can be achieved by means of the intramolecular hydroaminomethylation of 2-isopropenylanilines, mediated by an ionic diamino rhodium catalyst that does not require phosphine—this reaction is highly chemo- and regioselective, and it occurs in good isolated yields.
Rhodium‐Catalyzed Annulation of
<i>ortho</i>
‐Alkenyl Anilides with Alkynes: Formation of Unexpected Naphthalene Adducts
作者:Andrés Seoane、Cezar Comanescu、Noelia Casanova、Rebeca García‐Fandiño、Xabier Diz、José L. Mascareñas、Moisés Gulías
DOI:10.1002/anie.201811747
日期:2019.2.4
o‐Alkenyl N‐triflylanilides underwent rhodium(III)‐catalyzed oxidative annulations with alkynes to produce different types of naphthylamides in a process which involves the cleavage of two C−H bonds. Remarkably, besides formal dehydrogenative (4C+2C) cycloadducts, the reaction also produces variable amounts of isomeric naphthylamides, whose formation requires a formal migration of the alkenyl moiety