Synthese von cyanosubstiuierten Di- und Tetrahydropyridinen in DIMCARB (Dimethylamin-CO2-Additionsverbindung)
摘要:
A new selective method for base-catalyzed ring closure reaction of acetophenones (1a-1) with malononitrile in DIMCARB (dimethylamine-CO2-addition-compound) as solvent of high dimethylamine concentration is reported which allows effective syntheses of (1.2-dihydro-4-pyrid-6-yl)dicyanomethanides and 5-cyano-6-dicyanomethylene-1,2,3,6-tetrahydropyridines in good yields, The structure of the two new classes of compounds is proved by X-ray diffraction analysis.
Cu(OAc)<sub>2</sub>/DABCO-mediated domino reaction of vinyl malononitriles with cyclic sulfamidate imines: access to 6-hydroxyaryl-2-aminonicotinonitriles
A novel Cu(II)–salt/DABCO-mediated one-pot access to a myriad of highly substituted biologically relevant 2-aminonicotinonitriles possessing a resourceful phenolic moiety with satisfactory yields is reported. This method involves cyclic sulfamidate imines as 1C1N sources and different kinds of acyclic/cyclic vinyl malononitriles as 4C sources for pyridine synthesis via a vinylogous Mannich-cycloaromatization