New Synthetic Strategy for Diporphyrins: Pinacol Coupling–Rearrangement

摘要

A new peak for porphyrins! A new approach to methylene-bridged diporphyrins has been explored, which consists of SmI₂-mediated pinacol coupling followed by BF₃-assisted pinacol-to-pinacolone rearrangement (see scheme). Diporphyrin 1 can further undergo multiple, dehydrative CC bond formation to yield tetrahydropentalene-fused porphyrin dimer 2 with a rigid gable structure.