Abstract
AbstractAzachlorins rac‐10a,b, rac‐11, and rac‐16, a novel type of hydroporphinoid compounds, were synthesized from azaporphyrins 8 and 13 by regioselective cycloaddition of singlet oxygen and further transformation by amide acetal Claisen rearrangement. The azaporphyrins are readily accessible from the naturally occurring bile pigment bilirubin (5). The photophysical properties of the azachlorins recommend these chlorin derivatives as potential photosensitizers for Photodynamic Therapy (PDT).
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