intermediates and a process for producing beta-adrenergic agonists receptors.

摘要

A process for preparing a compound of the formula: ** (Formula) ** comprising deprotecting a compound of formula (II): ** (Formula) ** wherein said compound of formula (II) is obtained from of a compound of formula (IV): ** (formula) ** wherein said compound of formula (IV) is prepared by reacting a compound (20) with the following formula: ** (formula) ** with a compound (25) with the following formula: ** (formula) ** wherein R1 is C1-C8 alkyl and R2 and R3 are independently C1-C3 alkyl or phenyl.