Phosphorus(V) tetrapyrazinocorrolazines — first corrolazine derivatives with fused heterocyclic rings

Tetrapyrazinocorrolazines — first corrolazine derivatives with annulated heterocycles — have been prepared as phosphorus(V) complexes by the reaction of metal free tetrapyrazinoporphyrazines [( R ₈ TPyzPA ) H ₂] (R = Ph, Me) with phosphorus(III) chloride or bromide in pyridine. Oxophosphorus(V) complexes [( R ₈ TPyzCA ) P = O ] were obtained when the reaction mixture was poured into water, while dilution with methanol leads to dimethoxyphosphorus(V) complexes [( R ₈ TPyzCA ) P ( OMe )₂]. The obtained compounds were characterized by MALDI-TOF mass-spectrometry and by IR, ¹ H , ³¹ P NMR measurements. Their UV-vis spectral and basic properties in CH ₂ Cl ₂– CF ₃ COOH medium were studied in comparison to phosphorus(V) complex of octaphenylcorrolazine [( Ph ₈ CA ) P = O ].