期刊
TETRAHEDRON
卷 69, 期 35, 页码 7269-7278出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.06.084
关键词
Asymmetric catalysis; Chiral oxazoline ligands; 1,2,4-Triazine; Enantioselective Henry reaction; Buchwald-Hartwig amination
Eleven members of new ligand class incorporating a chiral oxazoline and a 1,2,4-triazine ring have been synthesized via Pd-catalyzed amination reaction of 3-halo-1,2,4-triazines with 2-(o-aminophenyl)oxazolines. Buchwald-Hartwig amination of 3-halo-1,2,4-triazines was investigated to establish the best conditions for synthesis of the title ligands. Catalytic activity of the new ligands was evaluated in the asymmetric Henry reaction of nitromethane with a variety of aromatic and aliphatic aldehydes. The beta-hydroxy nitroalkanes were obtained in high yields (up to 95%), and moderate-to-good enantioselectivity (up to 82% ee). (C) 2013 Elsevier Ltd. All rights reserved.
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