Synthesis of a New Library of Pyrano‐phenazine Derivatives via a Novel Three‐Component Protocol

The pyrano‐phenazine derivatives 6 were synthesized by an efficient procedure using the reaction between benzoa]phenacin‐5‐ols with the condensation product of an aldehyde with Meldrum's acid in the presence of a catalytic amount of Et₃N at ambient temperature. The procedure is very simple, and products could be separated from the reaction media by simple filtration. High functional‐group tolerance both in the benzoa]phenazin‐5‐ol and aldehyde moieties, facile reaction procedure, medium‐to‐high yields, and simple separation of the products from the reaction media are the advantages of this route.