Transient azovinylphosphonates, generated in situ by base induced dehydrohalogenation of the corresponding 2-bromo-and 2-chloro-acetylphosphonate-tertbutoxycarbonyl hydrazones are intercepted by electron rich alkenes and heterocycles in hetero Diels-Alder reactions, producing tetrahydopyridazine-3-phosphonates or open chain α-hydrazono phosphonates.
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