Acetic Anhydride → Tert-butyl ((4-cyanothiazol-2-YL)methyl)carbamate

Participants

Reaction Steps

To a cooled (0° C.) solution of 2-(N-Boc-aminomethyl)thiazole-4-carboxamide (200 mg, 0.78 mmol, see Angew. Chem. Int. Ed. Engl. 1996, 35, 1503) in dichloromethane (7 mL) was added triethylamine (0.32 mL, 2.34 mmol) and acetic anhydride (0.22 mL, 1.56 mmol) and the mixture stirred for 1 h. After the solvent was removed, the residue was purified by column chromatography (EtOAc: n-hexane, 3:7). 2-(N-Boc-aminomethyl)thiazole-4-carbonitrile (150 mg, 0.627 mmol) thus obtained was dissolved in methanol (10 mL) and cooled to 0° C. To this was added dropwise acetylchloride (30 equivalent) and the mixture stirred for 1 h at rt. The solvent was removed in vacuo to give the title compound (90 mg, 81%).

Provenance & Evidence