Abstract
Stereoisomers of nadolol were derivatized with S-(-)-menthyl chloroformate((-)-MCF) forming their diastereomers, RSR-nadolol-(-)-MCF, SRS-nadolol-(-)-MCF, RRS-nadolol-(-)-MCF and SSRnadolol-(-)-MCF. Diastereomeric mixture were then chromatographically resolved by preparative HPLC (JAIGEL-ODS-BP-L, 500 × 25 mm column) eluted with methanol-water (84:16, v/v) at flow rate 2.5 mL/min. RSR-nadolol-(-)-MCF diastereomer was hydrolyzed with 5% LiOH at 80°C for 48 h, and the decomposed mixture was further purified by semi-preparative HPLC. The purity and final yield of RSR-nadolol were 99.97% and 12.95%, respectively.
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