Novel magnesium and zinc porphyrazines containing galactose moieties: Synthesis via click reaction and characterization

• It is first time, porphyrazino zinc complex has been prepared at one-step reaction by using Zn(BuO)2 as template agent.
• The different routes were used for comparative synthesis of substituted dicyano compound and porphyrazine.
• Better performance can be achieved with the dicyano compound. The advantage of proposed method is short reaction time and moderate yield by the “click” reaction.
• The magnesium porphyrazine water solubility is related to the deprotection of isopropylidene groups.

In this study, galactose conjugated new magnesium and zinc porphyrazines were synthesized by the cyclotetramerization reaction of 2,3-bis[1-(2,2,7,7-tetramethyltetra-hydro-bis[1,3]dioxolo[4,5-b;4′,5′-d]pyran-5,methyl)-1H-[1,2,3]triazol-4-yl methylsulfanyl]-but 2-enedinitrile. This substituted dicyano compound was prepared via two different routes. One started from cis-1,2-dicyano-1,2-ethylenedithiolate disodium, [1-(2, 2, 7,7-tetramethyltetrahydrobis[1,3]dioxolo[4,5-b;4′,5′-d]pyran-5-yl-methyl)-1H-[1,2,3]triazo-l-4-yl]methanol and ended in a multi-step reaction sequence via Click procedures. The other reaction was between 5-azidomethyl-2,2,7,7-tetramethyltetrahydro-bis[1,3]dioxolo[4,5-b;4′,5′-d]pyran and (2Z)-2,3-bis(prop-2-yl-1-yl-thio)but-2-enedinitrile. A very soluble galactose linked magnesium porphyrazine derivative in common polar solvents and water was achieved by the deprotected isopropylidene groups in TFA and water media. It is first time, zinc porphyrazine complex has been achieved at one-step reaction by using Zn(BuO)2 as template agent. The new compounds have been characterized by a combination of elemental analysis, 1H, 13C NMR, IR, UV–vis and MS spectral data.

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