3 - and / or 4 - substituted china acid derivatives and process for the production of 3 - and / or 4 - substituted china acid derivatives

摘要

3- or 4-Mono-, 1,3- or 1,4- or alternatively 3,4-disubstituted derivatives of quinic acid are prepared by reacting a derivative of a hydroxycinnamic acid, in which the phenol group(s) is(are) protected, with a quinic acid derivative so as to form an ester, taking advantage of the different reactivities of the OH functional groups in the 3 and 4 positions in order to carry out the esterification selectively under low temperature conditions, and then the protective groups are cleaved under controlled acidity and temperature conditions. These conditions prevent any degradation or isomerisation. The process makes possible the preparation of new quinides with a good yield.