Iridium-Catalyzed Allylic Substitutions with Cyclometalated Phosphoramidite Complexes Bearing a Dibenzocyclooctatetraene Ligand: Preparation of (π-Allyl)Ir Complexes and Computational and NMR Spectroscopic Studies
作者:Jevgenij A. Raskatov、Mascha Jäkel、Bernd F. Straub、Frank Rominger、Günter Helmchen
DOI:10.1002/chem.201201772
日期:2012.11.5
(π‐Allyl)Ircomplexes derived from dibenzocyclooctatetraene and phosphoramidites by cyclometalation are effective catalysts for allylicsubstitution reactions of linear monosubstituted allylic carbonates. These catalysts provide exceptionally high degrees of regioselectivity and allow the reactions to be run under aerobic conditions. A series of (π‐allyl)Ircomplexes were prepared and characterized
Novel palladium-catalyzed reactions of arenediazonium tetrafluoroborates with N,N-diprotected allylamines are presented. The reaction of arenediazonium tetrafluoroborates with N,N-(Boc)2 allylamine allows for an easy approach to cinnamylamines whereas using 2-alkynyl-N-(allyl)trifluoroacetanilides and 2-iodo-N-(allyl)trifluoroacetanilide the reaction provides a useful tool for appending indole rings
Enantioselective intermolecular bromoesterification of allylic sulfonamides
作者:Wei Zhang、Na Liu、Casi M. Schienebeck、Xin Zhou、Izarin I. Izhar、Ilia A. Guzei、Weiping Tang
DOI:10.1039/c3sc50446h
日期:——
Highly enantioselective intermolecular bromoesterification of alkenes was achieved for the first time. Both C–O and C–Br bonds were introduced enantioselectively in this olefin addition reaction. The sulfonamide NH directing group is important for both the reactivity and enantioselectivity.