Diethyl acetonedicarboxylate — a precursor for the synthesis of new substituted 4-aminoquinolines and fused 4-aminopyridines
摘要:
The reaction of cyclic enaminonitriles 1 with diethyl acetonedicarboxylate (2) affords fused 4-amino-3-ethoxycarbonyl-2-ethoxycarbonylmethyl-pyridines 4. The course of the reaction and the yield of cyclic products were promoted by tin(IV)chloride. N-substituted diethyl 3-aminoglutaconates 3 seem to be intermediates of the cyclization reaction.
Isomerization of N-aryl substituted diethyl 3-aminoglutaconates. Part I
摘要:
Diethyl acetonedicarboxylate 1 under acid catalysis reacts with aromatic amines and 2-aminonitriles 2 forming N-aryl substituted diethyl 3-aminoglutaconates 3. The structures of the products 3 were studied both in the solid and the liquid state. The presence of the double bond permits two isomeric forms. These E and Z isomers can interchange with one another under catalysis by either an acid or a base in a suitable solvent. The isomeric equilibriums were studied by H-1 NMR spectroscopy with respect to dependence on the polarity of the solvent, the temperature and the substitution present on the aromatic skeleton.