Synthesis by electrocarboxylation to obtain useful intermediates for the synthesis of span derivatives

摘要

Process for obtaining a compound selected from the group consisting of ** Formula ** in which Y is an alkyl or benzyl group, comprising the steps of: a) reacting a solution of the compound ** Formula ** in the that R1 is H or methyl; with a saturated solution of CO2 under a potential between -1.5 V and -2.0V; b) adding an alkylating agent YX, in which Y is an alkyl or benzyl group and X is I, Br or Cl, in a concentration in a molar excess of 2 to 50 times; and c) bubble the resulting solution under inert gas.