V. Karunaratne et D. Dolphin, OXIDATION OF SUBSTITUTED 2-METHYLPYRROLES WITH PERHALOGENATED METALLOPORPHYRINS - A ONE-POT SYNTHESIS OF DIPYRROMETHANES, Tetrahedron letters, 37(5), 1996, pp. 603-604
A variety of substituted 2-methylpyrroles underwent allylic oxidation
with the perchlorinated metalloporphyrin 2 and iodosylbenzene in TFA/C
H2Cl2 (9:1). Subsequent addition of an alpha-free pyrrole to the same
reaction mixture afforded an efficient one-pot route to dipyrromethane
s.