A Convenient and Effective Method for Synthesizing β‐Amino‐α,β‐Unsaturated Esters and Ketones
作者:Yuanhe Gao、Qihan Zhang、Jiaxi Xu
DOI:10.1081/scc-120028364
日期:2004.12.31
Abstract A convenient and effective method for the preparation of β‐amino‐α,β‐unsaturated esters and ketones has been developed through silica gel‐catalyzed and solvent‐free reactions of β‐dicarbonylic compounds with ammonia and primary amines.
Palladium catalyzed Suzuki cross-coupling reactions using N,O-bidentate ligands
作者:Yi-Chun Lai、Hsuan-Ying Chen、Wen-Chou Hung、Chu-Chieh Lin、Fung-E Hong
DOI:10.1016/j.tet.2005.08.005
日期:2005.10
Palladium-catalyzed Suzuki cross-coupling reactions employing Schiff-bases as ligands toward a series of substituted arylbromides and boronic acids were pursued. In the presence of a N,O-bidentate ligand, 2-[1-(2,4,6-trimethyl-phenylimino)-ethyl] -phenol 5, the catalytic reactions could be carried out efficiently at room temperature with a wide array of arylbromides, even with electronically deactivated arenes. A deprotonated 5, 5', chelated palladium acetate complex, [5'Pd(II)(OAc)(solv)] 8, was proposed as a precursor of a genuine catalytically active species. (c) 2005 Elsevier Ltd. All rights reserved.
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