How is Atorvastatin Impurity 24 (CAS: 693793-82-7) typically synthesized?

Atorvastatin Impurity 24 (CAS: 693793-82-7) is synthesized through various organic synthesis routes involving stereoselective reactions. Commonly, it is produced via hydrogenation of a key intermediate, followed by selective functional group manipulations. The process often utilizes transition metal catalysts and employs high-pressure hydrogenation techniques to achieve the desired stereochemistry and yield.