abundant and sustainable alcohols as the alkylating reagents, a new and direct alkylation method has been demonstrated. This method enables the selective alkylation of the less substituted pyridyl ring at the β-site of aryl-1,8-naphthyridines, affording the desired products in moderate to excellent yields upon isolation. The method proceeds under transition-metal-free conditions in an atom- and step-economic
Through cooperative actions of iridium catalyst and NaOTf additive we report a new direct access to nitrogen bi-heteroarenes via hydrogen-evolution cross-coupling of the β-site of indoles/pyrrole with the α-site of N-heteroarenes. The reaction proceeds in an atom- and redox-economic fashion together with the merits of an easily available catalyst system, broad substrate scope, excellent functional
Catalytic activity in transfer hydrogenation using ruthenium (II) carbonyl complexes containing two 1,8-naphthyridine as N-monodentate ligands
作者:Juana Gajardo、Juan C. Araya、Andrés Ibáñez、Véronique Guerchais、Hubert Le Bozec、Sergio A. Moya、Pedro Aguirre
DOI:10.1016/j.ica.2018.10.037
日期:2019.2
N-monodentate fashion. The ruthenium(II) complexes have been studied as catalysts in the transfer hydrogenation of acetophenone. We found that complexes show moderate activities and a 100% selectivity. The best turnover frequency (390 h−1) is found for cis-[RuCl2(CO)2(2-(4′-methoxyphenyl)-1,8-naphthyridine-κN8)2] when the substrate/catalysis ratio was 1000/1. The catalytic conditions were optimized
Ruthenium-Catalyzed Enantioselective Hydrogenation of 1,8-Naphthyridine Derivatives
作者:Wenpeng Ma、Fei Chen、Youran Liu、Yan-Mei He、Qing-Hua Fan
DOI:10.1021/acs.orglett.6b01186
日期:2016.6.3
The first asymmetric hydrogenation of 2,7-disubstituted 1,8-naphthyridines catalyzed by chiral cationic ruthenium diamine complexes has been developed. A wide range of 1,8-naphthyridine derivatives were effectively hydrogenated to give 1,2,3,4-tetrahydro-1,8-naphthyridines with up to 99% ee and full conversions. The method provides a practical and facile approach to the preparation of valuable chiral
Synthesis of 1,8-naphthyridines from 2-aminonicotinaldehydes and terminal alkynes
作者:Binbin Li、Steven Nguyen、Jianjun Huang、Gaigai Wang、Huiping Wei、Olga P. Pereshivko、Vsevolod A. Peshkov
DOI:10.1016/j.tetlet.2016.03.070
日期:2016.5
A copper(II) triflate-catalyzed diethylamine-assisted protocol for the reaction of 2-aminonicotinaldehydes and terminalalkynes leading to 1,8-naphthyridines is described. The overall process presumably involves a copper(II) triflate-catalyzed hydroamination of the triple bond followed by the Friedländer-type condensation of the resulting enamine with 2-aminonicotinaldehyde.