Abstract:
A process of producing a compound of the following formula (3): wherein R1 is a C1-5 alkyl group, R2 is a halogen atom, a C1-5 alkyl group, a C2-5 alkenyl group, a C2-5 alkynyl group, a C1-5 alkyl group, a C1-5 alkoxy group, a nitro group, or a hydroxy group, wherein multiple R2 may be the same or may be different, and a is an integer of from 0 to 4, comprising reacting a compound of the following formula (2): wherein R2 and a are as defined above with a C1-5-alkanesulfonyl chloride or C1-5-alkanesulfonic acid anhydride followed by hydrolyzing an N,N-disulfonated derivative of compound (3) to the compound of formula (3).
Abstract:
The invention relates to new polyesters of a polyol containing substituents with electrolyte properties with polymeric hydroxycarboxylic esters, their method of preparation and their use. The polyesters are particularly suitable for use in the preparation of sustained-release drugs.