Preparation process monohydrochloride 8-hydroxy-5 - (1R) -1-hydroxy-2 (1R) -2- (4-methoxyphenyl) -1- methylethyl amino ethyl -2 (1H) -quinolinone

摘要

A method of preparing a compound of formula: ** ** Formula or a salt thereof, comprising the steps of: (a) reacting a compound of formula: ** ** in Formula X is a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine and R is agroup hydroxyl protecting a compound of formula: ** ** formula wherein R 'is an amino protecting group.