Hydrochloric Acid → (S)-2-((tert-butoxycarbonyl)(methyl)amino)-3-(thiazol-4-yl)propanoic acid

Participants

Reaction Steps

A solution of (S)-2-((tert-butoxycarbonyl)amino)-3-(thiazol-4-yl)propanoic acid (Compound SP726) (800 mg, 2.94 mmol) in tetrahydrofuran (20 ml) was added dropwise to a suspension of sodium hydride (470 mg, 11.8 mmol, 60%) in tetrahydrofuran (30 ml) under a nitrogen atmosphere. Subsequently, iodomethane (1.67 g, 11.8 mmol) was added and the mixture was stirred at room temperature for 18 hours. The reaction solution was adjusted to pH 4 with 6 mol/1 aqueous hydrochloric acid and extracted with ethyl acetate. The organic extract was dried over sodium sulfate and then concentrated under reduced pressure, and the residue was purified by column chromatography (ethyl acetate) to afford (S)-2-((tert-butoxycarbonyl)(methyl)amino)-3-(thiazol-4-yl)propanoic acid (Compound SP727) (560 mg, 67%).

Provenance & Evidence