Dimethyl Carbonate → Methyl N-(4-methylpyridin-3-yl)carbamate

Beteiligte Stoffe

Reaktionsschritte

A solution of potassium tert-butoxide (32.8 g, 277 mmol) in THF (250 mL) at 0° C. was treated with 3-amino-4-methylpyridine (10.0 g, 92.5 mmol) and the resulting mixture stirred for 30 minutes before dimethyl carbonate (11.7 mL, 139 mmol) was added. The mixture was stirred for 30 minutes then quenched with water and extracted with ethyl acetate. The combined organic phases were washed with brine then dried over sodium sulfate and concentrated under vacuum. The resulting residue was purified by column chromatography on silica gel (DCM) then triturated with diethyl ether to afford 9.42 g (62%) of (4-methyl-pyridin-3-yl)-carbamic acid methyl ester. LCMS (Method B, ESI): RT=0.40 min, m+H=167.4; 1H NMR (400 MHz, CDCl3) δ: 8.86 (s, 1H), 8.28 (d, 1H), 7.12-7.12 (m, 1H), 6.45 (s, 1H), 3.80 (s, 3H), 2.28 (s, 3H).

Herkunft & Nachweise