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Aza-Wittig reaction of N-vinylic phosphazenes derived from diphenylmethylphosphine 4 with carbonyl compounds leads to the formation of 2-azadienes derived from β-aminoacids 5. Dimerization of 2-azadienes 5c,d and reaction of compounds 5 with phosphazene 4 or enemine 6 affords substituted dihydropyridines 7 and 8. Aza-Wittig reaction of phosphazenes 4 with α,β-unsaturated aldehydes gives 3-azatrienes...
Imidazo[1,5-a]pyridines 1 are prepared by reaction of N-vinylic phosphazene 3, obtained from phosphorus ylide 5 and 2-cyanopyridine 4, with aldehydes. Formation of fused heterocycles 1 can be explained through aza-Wittig reaction of phosphazene 3, followed by 1,5-electrocyclic ring closure of the resulting aldimines 2. Phosphazene 3 undergoes pyrido annelation by reaction with Diethyl Ketomalonate...
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