Abstract
AbstractA novel and efficient method has been developed for the synthesis of 2‐hydroxybenzoyl‐1H‐pyrazolylphosphonates and dihydrochromeno[3,2‐c]pyrazolylphosphonates by the reaction of 3‐formylchromones/3‐halo‐4H‐chromenones with Bestmann‐Ohira Reagent (BOR) in the presence of RuCl3 catalyst. The reactions proceeded through decarbonylation, debromination, intramolecular cyclization and N‐methylation to provide the new heterocyclic compounds in one‐pot with the formation of C−C and C−N bonds. The structure assignment of compound 3 f was confirmed by X‐ray analysis.
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