B. Gerlach et Fp. Montforts, SYNTHESIS OF AZASPIROGRAPHIS PORPHYRIN AND ITS TRANSFORMATION INTO ANAZACHLORIN, Tetrahedron letters, 34(40), 1993, pp. 6369-6370
Azaspirographis porphyrins 2a and 2b were prepared as precursors for t
he synthesis of geminally dialkylated azachlorins, a new class of pote
ntial long wavelength photosensitizers for photodynamic therapy of can
cer.