A new approach to protoporphyrinsIII (2′) and XIII (3′) has been developed based on a single set of starting materials, namely, 2,4-dimethyl-3-(2-chloroethyl)carbethoxypyrrole (4) and 3,3′-di(2-methoxycarbonylethyl)-4,4′-dimethyldipyrromethane-5,5′-dicarboxylic acid (5) for both targets. The biladiene route was adopted for the preparation of 2′ (five steps, 18% overall yield) while the coupling of
Synthesis of type III isomers of diacetyldeutero-, hemato-, and protoporphyrins with the use of Knorr's pyrrole
作者:Saburo Neya、Tomoki Yoneda、Tyuji Hoshino、Akira T. Kawaguchi、Masaaki Suzuki
DOI:10.1016/j.tet.2016.05.030
日期:2016.7
Derivation of the Knorr's pyrrole with 2-ethyl and 4-benzyl mixed-ester groups into 3,3′-diacetyl-5,5′-diiodo-4,4′-dimethyl-2,2′-dipyrromethane was developed. Coupling of the dipyrromethane with 5,5′-diformyl-3,3′-bis(2-methoxycarbonylethyl)-4,4′-dimethyl-2,2′-dipyrro-methane afforded in a reasonable yield diacetyldeuteroporphyin III with C2v symmetry. The porphyrin was further converted to protoporphyrin