Novel Approach to Chlorins and Bacteriochlorins: [8 pi+2 pi] Cycloaddition of Diazafulvenium Methides with Porphyrins

[摘要]：New and unprecedented [8 pi+2 pi] cycloaddition of diazafulvenium methides with porphyrins and chlorins is reported. The synthetic methodology allowed the access to a new type of 4,5,6,7-tetrahydropyrazolo[1,5-alpha]pyridine-fused chlorins and bacteriorins in a selective fashion.

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