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Synthesis of fused heterocyclic nitrogen systems containing phosphorus atom via [1+4] Cyclocondensation, [3+2] cycloaddition, and 1,5-electrocyclization reactions are reviewed. Also, the modified synthesis methodology applicable to the fused phospha-five and six-membered rings.doi:10.13005/ojc/310101 fatcat:mmbv2hlxzfgm7axe7hweorfbeq