Process for the manufacture of the calcium salt of rosuvastatin and crystalline intermediates thereof

摘要

A process for the manufacture of the calcium salt of (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl](3 R ,5 S )-3,5-dihydroxyhept-6-enoic acid, useful as an HMGCoA reductase inhibitor, from a compound of the formula (7)
wherein A is an acetal or ketal protecting group and R is alkyl, via isolated crystalline compounds of the formula (8) or of formula (10)
is described. Crystalline intermediates of formulae 7, 8 and 10 are also described.