2-Hydroxybenzaldehydes 1a-e on reaction with malononitrile 2 in the presence
of iodine as catalyst give 3-cyanocoumarins 3a-e in one step under thermal
heating as well as microwave irradiations. The latter conditions are much
more efficient in terms of time (2-5 minutes) and yield as compared to
thermal conditions (2-2.5 hours). Following similar procedure,
3-cyano-4-methylcoumarins 3f-i have also been prepared by the reaction of
2-hydroxyacetophenones 1f-i with malononitrile 2.