Abstract
3-Phosphinyl 1-aza-1,3-butadienes 2 are obtained by aldol condensation between hydrazonoalkyl phosphine oxides and N, N-dimethylformamide dimethyl acetal. Transamination reaction of these azadienes with amines yields functionalized 1-aza-1,3-butadienes 3 . Cycloaddition processes of these azadienes 2a with electron-poor dienophiles to give phosphorylated pyridine derivatives 9 and 15 are also reported, while intramolecular cyclization reaction of heterodiene 2b affords phosphorylated pyrazole 17 .
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