Tolterodine impurity
Tolterodine impurity is a diastereomeric byproduct arising from asymmetric synthesis of the quinuclidine core in Tolterodine production. It retains the 1,2,3,4-tetrahydroquinuclidine scaffold with an 8-methyl substituent but features a reversed stereochemistry at the C3 position, altering the spatial orientation of the 4-methylphenylmethyl and 2,3-dihydroxybenzoyl ester moieties. This structural inversion reduces the molecule's conformational fit to muscarinic receptor binding sites. The compound serves as a critical HPLC reference standard for chiral purity analysis in Tolterodine API batches.
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