PROCESS FOR THE PREPARATION OF TRITERPENE DERIVATIVES

摘要

The present invention provides 3.beta.-hydroxy-18.beta.-olean-9-en-30-oic acids of the formula: (I) and corresponding esters in the 3-position with mono- and dicarboxylic acids containing from 2 to 5 carbon atoms, as well as the pharmaceutically acceptable salts thereof with alkaline metals, amino acids and copper. These compounds have a pronounced anti-ulcer action and do not cause sodium retention at the effective dose levels which, together with a low toxicity of active doses, makes them very interesting pharmacologically.