The Palladium-Catalyzed Trifluoromethylation of Vinyl Sulfonates
摘要:
A method for the palladium-catalyzed trifluoromethylation of cyclohexenyl sulfonates has been developed. Various cyclohexenyl triflates and nonaflates underwent trifluoromethylation under mild reaction conditions using a catalyst system composed of Pd(dba)(2) or [(ally1)PdCl](2) and the monodentate biaryl phosphine ligand (t)BuXPhos. The trifluoromethyl anion (CF3-) or its equivalent for the process was generated in situ from TMSCF3 in combination with KF or TESCF3 in combination with RbF.
Direct Pd-Catalyzed Cross-Coupling of Functionalized Organoaluminum Reagents
作者:Klaus Groll、Tobias D. Blümke、Andreas Unsinn、Diana Haas、Paul Knochel
DOI:10.1002/anie.201205987
日期:2012.10.29
A handsome couple: Through the use of the simple Pd catalyst [Pd(tmpp)2Cl2] (tmpp=tris(2,4,6‐trimethoxyphenyl)phosphine) and THF/DMF as solvent, various aryl‐, heteroaryl‐, benzyl‐ and alkylaluminum reagents can be readily cross‐coupled with aryl or heteroaryl iodides, bromides, and nonaflates, and in special cases even with chlorides and triflates. This cross‐coupling tolerates free NH2 groups, aldehydes
Practical Ni-Catalyzed Cross-Coupling of Unsaturated Zinc Pivalates with Unsaturated Nonaflates and Triflates
作者:Maximilian S. Hofmayer、Ferdinand H. Lutter、Lucie Grokenberger、Jeffrey M. Hammann、Paul Knochel
DOI:10.1021/acs.orglett.8b03417
日期:2019.1.4
A practical nickel-catalyzed cross-coupling of (hetero)aryl or alkynylzinc pivalates with various unsaturated nonaflates or triflates is described. Organozinc pivalates allow these cross-couplings to take place with high yields and a low catalyst loading (0.5 mol %). Couplings with (E)- and (Z)-alkenyl triflates proceed with retention of configuration.