Procedure for obtaining tolterodine.

Procedure for obtaining tolterodine. The process comprises reacting a compound of formula (II), wherein R is a hydroxyl protecting group, and the asterisk indicates an asymmetric carbon atom, with diisopropylamine in the presence of a reducing agent; removing the hydroxyl protecting group; and, if desired, separating the (R) or (S) desired, or the mixture of enantiomers, and / or converting the compound obtained into a pharmaceutically acceptable salt thereof. Tolterodine is an antagonist of muscarinic receptors useful in the treatment of urinary incontinence and other symptoms of urinary bladder hyperactivity.