Process for preparing derivatives pyrrole-3-carboxylic acid 1-substituted.

SIMPLE is provided a process for preparing and industrially VIABLE acid derivative pyrrolo-3-carboxylic acid 1 SUBSTITUTED of formula (I). The process comprises reacting a compound of formula (II), a compound of formula (III), and an anhydride acid according to the following reaction, wherein R {SUB 1} YR {SUB, 2} individually represent A alkyl, aralkyl or aryl.