Patent ID: 8022229

Claim:
A method of manufacturing esters of dicarboxyimidolevulinic acid and alkyl trans-4-oxo-2-pentenoate, comprising a first step of bromination of alkylic levulinate, to obtain a mixture of alkyl-3-bromolevulinate and alkyl-5-bromolevulinate, and a second step of synthesis of esters of dicarboxyimidolevulinic acid and alkyl trans-4-oxo-2-pentenoate, by reacting the alkyl-3-bromolevulinate/alkyl-5-bromolevulinate mixture, obtained in said first step, with a dicarboxylmide anion, and a third step of separation of esters of dicarboxyimidolevulinic acid and alkyl trans-4-oxo-2-pentenoate.