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2005
Benzopyran derivatives
R 0350
Chemistry of 3-Hetarylcoumarins. Part 2. 3-(2-Thiazolyl)coumarins. — A series
3-(2-thiazolyl)coumarins (III) (9 examples) is prepared by condensation of salicyl35- 156 of
aldehydes (I) with thiazolylacetonitriles (II) followed by hydrolysis of the intermediate
iminocoumarins with diluted H2SO4. Methylation, acylation, and aminomethylation
reactions of the 7-hydroxy-substituted derivatives (IIIa-d) are studied. Interestingly,
solutions of some Mannich bases (IX) fluoresce during excitation by visible light. —
(KHILYA, O. V.; SHABLYKINA, O. V.; FRASINYUK, M. S.; TUROV, A. V.;
ISHCHENKO, V. V.; KHILYA, V. P.; Chem. Heterocycl. Compd. (N. Y.) 40 (2004) 11,
1408-1420; Taras Shevchenko Kiev. Natl. Univ., Kiev 252601, Ukraine; Eng.) —
R. Staver
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