PROCESS FOR THE PREPARATION OF AN OPTICALLY PURE ENANTIOMER OF FORMOTEROL

摘要

The invention relates to a novel useful process for the preparation of the optically pure R,R-enantiomer of formoterol. The process is carried out by chromatographic separation on a chiral stationary phase consisting of a polysaccharide whose free hydroxyl groups are derivatised by the 4-methylbenzoyl group, and isolating the optically pure enantiomers.