Elemental Sulfur as Reaction Medium for the Synthesis of Fused Nitrogen Heterocycles by Oxidative Coupling between Cycloalkanones and Nitrogen Nucleophiles
作者:Thanh Binh Nguyen、Pascal Retailleau
DOI:10.1002/adsc.201700919
日期:2017.11.10
Molten elemental sulfur was found to be an excellent reaction medium for oxidative coupling between bis-aza nucleophiles and cycloalkanones to the fused diaza heterocycles. No extensive aromatization was observed when cyclohexanone was used. These reaction conditions tolerate a wide range of functional groups and are applicable to oxidation sensitive o-phenylenediamines.
作者:Meng-Yang Chang、Tein-Wei Lee、Ru-Ting Hsu、Tzu-Lin Yen
DOI:10.1055/s-0030-1260147
日期:2011.10
Substituted tricyclic or tetracyclic quinoxalines, tricyclic pyridoquinoxalines and bis-quinoxalines were synthesized in high yields starting from cyclic ketones by the α-bromination of cyclic ketones with N-bromosuccinimide (NBS) followed by condensation of the resulting α-bromo ketones with 1,2-diaminobenzene, 3,4-diaminopyridine, or 3,3′-diaminobenzidine. condensation - halogenation - tandem reactions
Asymmetric Transfer Hydrogenations of 2,3-Disubstituted Quinoxalines with Ammonia Borane
作者:Songlei Li、Wei Meng、Haifeng Du
DOI:10.1021/acs.orglett.7b00935
日期:2017.5.19
An asymmetrictransferhydrogenation of 2,3-disubstituted quinoxalines using a chiral frustrated Lewis pair of Piers’ borane and (R)-tert-butylsulfinamide as the catalyst with ammoniaborane as the hydrogen source has been successfully realized. For 2-alkyl-3-arylquinoxaline substrates, cis-tetrahydroquinoxalines were obtained as the predominant products in high yields with 77–86% ee. In contrast,
Ketones as a new synthon for quinoxaline synthesis
作者:Chan Sik Cho、Wen Xiu Ren、Sang Chul Shim
DOI:10.1016/j.tetlet.2007.05.044
日期:2007.7
o-Phenylenediamines react with an array of ketones in PEG-400 at 60 degrees C under an atmosphere of air in the presence of KOH to afford the corresponding quinoxalines in good yields. (c) 2007 Elsevier Ltd. All rights reserved.
Utsukihara, Takamitsu; Koshimura, Masahiro; Kitsuta, Kazunori, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2016, vol. 55B, # 12, p. 1495 - 1502
作者:Utsukihara, Takamitsu、Koshimura, Masahiro、Kitsuta, Kazunori、Sato, Akinori、Matsushita, Masatoshi、Takahashi, T. Tomoyoshi、Horiuchi, C. Akira