Benzopyran derivatives R 0350Reaction of 4-Hydroxycoumarin with Arylglyoxals and Ureas. -One-pot condensation reactions of 4-hydroxycoumarin (I) with various arylglyoxals and ureas afford imidazolylchromene derivatives (IV) (12 examples) instead of the expected benzopyrano[4,3-d]pyrimidine derivatives. -(KOLOS*, N. N.; GOZALISHVILI, L. L.; SIVOKON, E. N.; KNYAZEVA, I. V.; Russ.
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