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2004
Fused pyrimidine derivatives
R 0515
Novel Aspects of the Reaction of 3-(Benzimidazol-2-yl)-2-imino-coumarins with
Aldehydes. — Reaction of the title benzimidazolyl-2-iminocoumarins with
51- 127 Aromatic
aromatic aldehydes provides the corresponding pentacyclic heterocycles [cf. (III),
(VII)] or the 2-iminocoumarin hydrolysis products (V) depending on the substitution
pattern of both the starting imine and aldehyde compounds. Imines (IV) form condensation products (VII) only in reactions with aromatic aldehydes bearing donor
substituents. The condensation products (III) and (VII) isomerize in DMF medium
[-> (VIII)]. — (GOROBETS, N. Y.; ABAKUMOV, V. V.; BORISOV, A. V.;
NIKITCHENKO, V. M.; Chem. Heterocycl. Compd. (N. Y.) 40 (2004) 3, 334-342;
Karazin Natl. Univ., Kharkov 61077, Ukraine; Eng.) — Koehler
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