PROCESS FOR PREPARING PORPHYRIN DERIVATIVES, SUCH AS PROTOPORPHYRIN(IX) AND SYNTHESIS INTERMEDIATE

摘要

The present invention relates to a process for preparing a porphyrin of formula (I), optionally in the form of a salt with an alkali metal and/or in the form of a metal complex: in which: R and R are as defined in claim 1, comprising: a step of condensation, in an acidic medium, between a dipyrromethane of formula (II): in which Rb is as defined above for (I), and a dipyrromethane of formula (III): in which R is as defined in claim 1, and also the compounds of formula (III).