Neopentylphosphines as effective ligands in palladium-catalyzed cross-couplings of aryl bromides and chlorides
作者:Lensey L. Hill、Joanna M. Smith、William S. Brown、Lucas R. Moore、Paul Guevera、Emily S. Pair、Jake Porter、Joe Chou、Christopher J. Wolterman、Raluca Craciun、David A. Dixon、Kevin H. Shaughnessy
DOI:10.1016/j.tet.2008.02.037
日期:2008.7
The use of neopentylphosphine ligands in the palladium-catalyzed Suzuki, Sonogashira, Heck, and Hartwig–Buchwald couplings of arylbromides and chlorides are reported. Di-tert-butylneopentylphosphine (DTBNpP) provided highly active catalysts for the coupling of arylbromides at mild temperatures. Trineopentylphosphine, an air-stable trialkylphosphine, gave inactive catalysts at room temperature, but
Tandem Regioselective Hydroformylation-Hydrogenation of Internal Alkynes Using a Supramolecular Catalyst
作者:Weiwei Fang、Bernhard Breit
DOI:10.1002/anie.201809073
日期:2018.11.5
electron‐withdrawing groups. By applying this novel catalytic system, a general protocol for the Rh‐catalysed hydroformylation‐hydrogenation of unsymmetrical internal alkynes, functionalized with a carboxylic acid, was found to furnish aliphatic aldehydes in high regio‐ and chemoselectivities. Control experiments confirm the enzyme‐like supramolecular catalyst mode of action.
Divergent Syntheses of Fused β-Naphthol and Indene Scaffolds by Rhodium-Catalyzed Direct and Decarbonylative Alkyne-Benzocyclobutenone Couplings
作者:Peng-hao Chen、Tao Xu、Guangbin Dong
DOI:10.1002/anie.201310100
日期:2014.2.3
A tunable rhodium‐catalyzed intramolecular alkyne insertion reaction proceeding through the CC cleavage of benzocyclobutenones is described. Selective formation of either the direct or decarbonylative insertion product can be controlled by using different catalytic systems. A variety of fused β‐naphthol and indene scaffolds were obtained in good yields with high functional group tolerance. This work
Cu-Catalyzed Tandem Aerobic Oxidative Cyclization for the Synthesis of 3,3′-Bipyrroles from the Homopropargylic Amines
作者:Zhenjie Qi、Yong Jiang、Bingxiang Yuan、Yanning Niu、Rulong Yan
DOI:10.1021/acs.orglett.8b02201
日期:2018.8.17
Cu-catalyzed method for the synthesis of 3,3′-bipyrroles from homopropargylic amines through tandem aerobic oxidative cyclization involving the formation of C–C bond has been developed. The features of this reaction are a small number of Cu catalysis and simple starting substrates. Moreover, this procedure exhibits good functional group tolerance and a series of 3,3′-bipyrroles derivatives are obtained
External Oxidant‐Free Oxidative Tandem Cyclization: NaI‐Catalyzed Thiolation for the Synthesis of 3‐Thiosubstituted Pyrroles
作者:Bingxiang Yuan、Yong Jiang、Zhenjie Qi、Xin Guan、Ting Wang、Rulong Yan
DOI:10.1002/adsc.201900620
日期:2019.11.19
A simple method for the synthesis of 3‐thiosubstituted pyrroles from homopropargylic amines and thiosulfonates via a tandem sulfenylation/cyclization has been developed. The thiosulfonates are used both as substrates and oxidants in this transformation. This procedure exhibits good functional group tolerance and a series of 3‐thiosubstituted pyrrole derivatives are obtained in moderate to good yields