METHOD FOR THE PREPARATION OF 1-(2-HALOGEN-ETHYL)-4 PIPERIDINE-CARBOXYLIC ACID ETHYL ESTERS

摘要

The present invention refers to a process for the preparation of 1-(2-halogen-ethyl)-4-piperidinecarboxylic acid ethyl esters, in particular of 1-(2-chloroethyl)-4 piperidinecarboxylic acid ethyl ester, a versatile synthesis intermediate, particularly useful as an intermediate compound in the synthesis of umeclidinium.