Friedländer reaction of 3-acetyltropolones: Synthesis of naphthyridinyl- and allied heterocyclic-substituted tropolones
作者:Ming-Zhu Piao、Kimiaki Imafuku
DOI:10.1002/jhet.5570330230
日期:1996.3
Five 3-acetyltropolones reacted with 2-amino-3-pyridinecarbaldehyde to afford the corresponding 3-(1,8-naphthyridin-2-yl)tropolones in excellent yields. In a similar manner, 1,6-naphthyridin-2-yl-,1,7-naphthyridin-2-yl-, 6-pyrido[2,3-b]pyrazinyl-, and 1-methyl-6-pyrazolo[5,4-b]pyridyl-substituted tropolones were prepared. Reactivities of amino-substituted heteroarenecarbaldehydes in these reactions
五个3-乙酰基丙酮酮与2-氨基-3-吡啶甲醛反应,以极好的收率得到相应的3-(1,8-萘啶-2-基)托洛酮。以类似的方式,1,6-萘啶-2-基-,1,7-萘啶-2-基-,6-吡啶基[2,3- b ]吡嗪基-和1-甲基-6-吡唑并[5 ,4- b制备]吡啶基取代的tropolones。还讨论了这些反应中氨基取代的杂亚芳基甲醛的反应性和产物的性质。
Transfer hydrogenative <i>para</i>-selective aminoalkylation of aniline derivatives with N-heteroarenes <i>via</i> ruthenium/acid dual catalysis
simplicity, a readily available catalyst system, excellent functional group tolerance, and exclusive regioselectivity, which offers a significant basis to access novel aniline derivatives that are currently inaccessible or challenging to prepare with conventional approaches, and design new coupling reactions via a hydrogen transfer strategy.
Alumina-supported iodobenzene diacetate [PhI(OAc)2-Al2O3] is a highly efficient reagent for the oxidative cyclization of [o-(1,8-naphthyridin-2-yl)phenoxy]acetic acid arylidene hydrazides to 5-aryl-2-[o-(1,8-naphthyridin-2-yl)phenoxymethyl]-1,3,4-oxadiazoles in solvent-free conditions undermicrowaveirradiation. The products are obtained in good yields and in a state of high purity. J. Heterocyclic
Ligand assisted homolytic cleavage of the Ru–Ru single bond in [Ru2(CO)4]2+ core and the chemical consequence
作者:Sanjib K. Patra、Moumita Majumdar、Jitendra K. Bera
DOI:10.1016/j.jorganchem.2006.07.033
日期:2006.11
non-oxidative and the product obtained is the cis-[Ru(hpNP)2(CO)2][BF4] (3). The bis-(diphenylphosphino)methane (dppm) in dichloromethane oxidatively cleave the Ru–Ru bond leading to chloro bridged [Ru(μ-Cl)(dppm)(CO)(MeCN)]2[BF4]2 (4). All the complexes have been characterized by the spectroscopic and electrochemical measurements and their structures have been established by X-ray diffraction study.