Hydrochloric Acid → (R)-3-[1-(4,6-Dimethyl-1,2-benzisothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-butyric acid

Participants

Reaction Steps

To a solution of (R)-3-[1-(4,6-dimethyl-1,2-benzisothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-butyric acid methyl ester (60 mg, 0.14 mmol) in THF (1 mL) is added a solution of LiOH (8.5 mg, 0.20 mmol) in water (0.5 mL) and the resulting mixture is agitated at ambient temperature for 24 hours, heated at 50° C. for 6 hours, then agitated an additional 48 hours at ambient temperature. The reaction mixture is neutralized with 1N HCl (0.2 mL) then extracted with ethyl acetate (2×10 mL). The combined extracts are washed with water (1×10 mL) and brine (1×10 mL), dried with sodium sulfate and concentrated to provide the title compound. LCMS (ESMS): m/z 410 (M+H+).

Provenance & Evidence