Acetyl chloride → HCID 24764501, compound

Participants

Reaction Steps

Preparation of (2S,3R,4R,5S)-2-[4-chloro-3-(4-ethoxy-benzyl)-phenyl]-6-methoxy-tetrahydro-pyran-3,4,5-triol. A solution of 0.35 M HCl in MeOH was prepared by adding AcCl (0.25 ml, 3.5 mmol) to MeOH (10 ml) and stirring for 15 minutes The alcohol from step D (0.84 g, 1.5 mmol) was treated with this solution for 16 hours at room temperature and 2 hours at 80° C. in a sealed vial. The reaction was cooled to room temperature, quenched with K2CO3 until basic, diluted with CH2Cl2, filtered, and concentrated under vacuum. The product was purified by flash chromatography (40 g SiO2, 0-10% MeOH: CH2Cl2, 60 minutes, 35 ml/min), suspended in H2O, and lyophilized to give (2S,3R,4R,5S)-2-[4-chloro-3-(4-ethoxy-benzyl)-phenyl]-6-methoxy-tetrahydro-pyran-3,4,5-triol (0.46 g, 1.1 mmol, 75%) as a white solid. NMR revealed a 1.2:1 ratio of α and β anomers.

Provenance & Evidence