反应详情

A mixture of 1.07 g (0.005 moles) of 3-(1H-tetrazol-5-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidine; 45 ml of dimethylformamide, 0.75 g (0.0055 moles) of anhydrous potassium carbonate and 0.76 ml (0.01 moles) of methyl chloroformate was stirred at 80°-90° C. for 6 hours. The hot reaction mixture was filtered; the crystals precipitating from the filtrate were collected to obtain 0.32 g (23.5%) of the 1:1 ratio mixture of the title compounds, which on crystallization from ethanol gave the 3-(1-methoxycarbonyl-1H-tetrazol-5-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidine, m.p.: 182°-183° C.

1. filtrationThe hot reaction mixture was filtered
2. customthe crystals precipitating from the filtrate
3. customwere collected
4. customto obtain
5. customon crystallization from ethanol