The present work describes a novel stability-indicating reversed-phase ultra performance liquid chromatography method for the separation and quantification of rosuvastatin (RSV) and its related impurities in the pharmaceutical dosage forms under forced degradation conditions. An unknown degradation impurity detected in the acid degradation was identified by using quadrupole time-of-flight mass spectrometry. The chromatographic separation was carried out on C-18 column (100 x 2.1 mm, 1.7 μm) using isocratic elution with methanol and 0.1% trifluoroacetic acid (50:50). The total run time was 12 min within which RSV as well as all related impurities and degradation products were separated. The developed method was validated for RSV and related impurities in pharmaceutical dosage forms.

2-Metoxi(2-tributilestaniletilideno)cicloexano 16 sofre transmetalação estereosseletiva sob tratamento com tetracloreto de estanho (IV) para gerar o tricloreto de alilestanho 19 que reage com aldeídos fornecendo (Z)-(3-hidroxialquilideno)-2-metoxicicloexanos 17a-g com excelente estereocontrole 1,5.

2-Methoxy(2-tributylstannylethylidene)cyclohexane 16 undergoes stereoselective transmetalation on treatment with tin(IV) chloride to generate the allyltin trichloride 19 which reacts with aldehydes to give the (Z)-(3-hydroxyalkylidene)-2-methoxycyclohexanes 17a-g with excellent 1,5-stereocontrol.