Synthesis of Symmetric meso-H-Dipyrrin Hydrobromides from 2-Formylpyrroles
摘要:
The reaction of 2-formylpyrroles in acidic methanol gives the corresponding symmetric, meso-H-4,6-dipyrrin hydrobromides. This convenient strategy involves initial deformylation under the acidic conditions, followed by immediate in situ reaction of the resulting alpha-free pyrrole with the remaining 2-formylpyrrole in solution to give the dipyrrin hydrobromide salt in good yield.