Abstract The reaction of β-diketones, ethylacetoacetare and malononitrile with α, β-insaturated β, β-difunctionnalized phosphonates constitutes a performant newroute leading to the formation of substituted 2-amino-4-phosphono-4H-pynnes. Moreover the reaction of dialkylphosphonates with 2-hydroxybenzylidenemalononitrile affords a new series of phosphorylated benzopyranes.