5,15-Diphenyl-7-oxobenzochlorins. Novel long-wavelength absorbing photosensitizers for photodynamic therapy
Abstract
Copper(II)-5,15-diphenylporphyrin 1 is converted to 5, 15-diphenyl-7-oxobenzochlorin 3(M = 2H) by a modified Vilsmeier formylation, BF3-catalysed cyclization, oxidation and demetallation.