Structural studies by nuclear magnetic resonance—XVIII
作者:G.J. Karabatsos、S.S. Lande
DOI:10.1016/s0040-4020(01)92599-2
日期:1968.1
Conformations and configurations were assigned to several N-Me imines and N-alkyl acetaldimines from analyses of their 60-Mc NMR spectra. All aldimines exist exclusively in the syn configuration. Interpretation of the vicinal and long-range (across 4 and 5 and bonds) spin-spin coupling constants of N-Me aldimines led to the conclusion that I and II are the minimum energy conformations of these compounds
Lewis acid induced rearrangement of 2,3-epoxy sulfides; regiospecific trapping of thiiranium ion intermediates with nitrogen heterocycles and amides. Use of imines as nucleophilic equivalents for the selective monoalkylation of primary amines
作者:Duncan M Gill、Neil A Pegg、Christopher M Rayner
DOI:10.1016/0040-4020(96)00036-1
日期:1996.3
The Lewisacidinduced conversion of 2,3-epoxysulfides into the corresponding 3-trimethylsilyloxy-1,2-thiiranium ions is described. Such intermediates react with silylated nitrogenheterocycles and amidesregiospecifically to form 1-substituted-3-hydroxy-2-thioethers in good to moderate yields with full stereochemical control. Exclusive N-alkylation is observed. When simple primaryamines are used
Secondary 2-aminoalkyl-5-pyridinols, e.g., those of the formula ##STR1## and acid addition salts thereof are cardioprotective, e.g., antiischemic agents.
Reactions of aromatic methyl ketimines with halonitriles as a new route to pyrimidines with two polyhaloalkyl groups
作者:Vyacheslav Ya Sosnovskikh、Boris I Usachev、Gerd-Volker Röschenthaler
DOI:10.1016/s0040-4020(01)01231-5
日期:2002.2
N-Isopropyl-(1-phenylethylidene)amine reacts with trichloroacetonitrile to give 1-azabutadiene derivative, which undergoes a double addition reaction with a variety of halonitriles affording fluoro- and chloro-containing pyrimidines. Pyrimidines with two poly-haloalkyl groups were obtained by the reaction of methyl ketimines with an excess of trichloroacetonitrile, trifluoroacetonitrile and 2,2,3,3-tetrafluoropropionitrile. (C) 2002 Elsevier Science Ltd. All rights reserved.
The gramine route to the Diels-Alder adducts of indolo-2,3-quinodimethanes
作者:Khalid Diker、Michèle Döéde Maindreville、Daniel Royer、Fabien Le Provost、Jean Lévy
DOI:10.1016/s0040-4039(99)01349-0
日期:1999.10
Indolo-2,3-quinodimethanes were smoothly generated by thermal fragmentation of 2-substituted 3-aminomethylindoles, and engaged in Diers-Alder reactions yielding 1,2,3,4-tetrahydrocarbazoles with a large array of possible substituents at either position. An intramolecular variant of the procedure generated a tetracyclic (unnatural) indolomonoterpene with complete control of three stereocenters. (C) 1999 Elsevier Science Ltd. All rights reserved.