Syntheses of Core-Modified Corroles by Three Different [3 + 1] Methodologies

Three new methods for syntheses of modified oxa
corroles bearing one meso free carbon in reasonably good
yields are reported. The formation of the meso carbon bridge
and the direct pyrrole−pyrrole linkage occur in a single step
by a simple condensation and coupling with TFA as a
catalyst with appropriate precursors. The reactions are
optimized with different conditions by varying the meso
substituents, acid catalyst concentration, and the nature of
the solvent to afford corroles in good yields.