Synthesis 2008(6): 875-882  
DOI: 10.1055/s-2008-1032203
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of a Series of Mono-meso-arylmesoporphyrins III of Biological Interest and Their Biliverdin Derivatives

Fernando Niemevz, Ma. Soledad Vazquez, Graciela Y. Buldain*
Cátedra de Química Orgánica II, Departamento de Química Orgánica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, (C1113AAD) Ciudad Autónoma de Buenos Aires, Argentina
Fax: +54(11)49648250; e-Mail: gbuldain@ffyb.uba.ar;
Further Information

Publication History

Received 22 November 2006
Publication Date:
28 February 2008 (online)

Abstract

Synthesis of a series of mono-meso-arylmesoporphyrins III using a MacDonald-type 2+2 condensation is described. In this method, the substituted 1,9-diformyldipyrromethane is treated with a dipyrromethane-1,9-dicarboxylic acid under acidic conditions. The 5-aryldipyrrolic unit was obtained by condensation of tert-butyl, ethyl, or benzyl 4-ethyl-3-methyl-1H-pyrrole-2-carboxylate with different aromatic aldehydes in the presence of 4-toluenesulfonic acid. In order to obtain the corresponding mesobiliverdins, chemical oxidation of each mesoporphyrin was carried out. Each meso-arylmesoporphyrin rendered two isomeric arylbiliverdins, as the porphyrin meso-aryl bridge is not cleaved.