HYDROLYSIS OF [R(R*,R*)]-2-(4-FLUOROPHENYL)-(3,6-DIHYDROXY-5-(1-METHYLETHYL)-3-PHENYL-4-[(PHENYLAMINO)CARBONYL]-1H-PYRROLE-1-HEPTANOIC ACID ESTERS WITH CALCIUM HYDROXIDE

摘要

The present invention provides a process for preparing atorvastatin hemi-calcium from an atorvastatin ester derivative with calcium hydroxide. The process is conveniently incorporated into a process for preparing atorvastatin hemi-calcium from an acetonide protected, ester protected beta,delta-dihydroxy heptanoic acid precursor compound by a first acid hydrolysis step followed by base hydrolysis with calcium hydroxide. The latter process may be performed as a one-pot process.