Methane → HCID 68139456, compound

Participants

Reaction Conditions

Reaction Steps

5-Hydroxy-6-(1,8-naphthyridin-2-yl)-7-oxo-2,3,6,7-tetrahydro-1,4-dithiino[2,3-c]pyrrole (8.45 g.) is added, at 0°C, to a suspension of sodium hydride (0.8 g.) in anhydrous dimethylformamide (125 cc.). The reaction mixture is stirred for half an hour at 0°C, and 1-chlorocarbonyl-4-methylpiperazine (8.45 g.) dissolved in anhydrous dimethylformamide (50 cc.) is then added. After stirring for two and a half hours at 5°C., the reaction mixture is diluted with ice-water (500 cc.). The precipitate which has appeared is filtered off, washed four times with distilled water (total 200 cc.) and twice with diethyl ether (total 50 cc.) and then dissolved in methylene chloride (300 cc.). The organic solution is washed four times with distilled water (total 160 cc.), dried over anhydrous sodium sulphate, treated with decolourising charcoal (0.2 g.) and evaporated. When the residual liquid reaches a volume of 50 cc., boiling acetonitrile (200 cc.) is added. After cooling for two hours at 2°C., the crystals which have appeared are filtered off, washed three times with ice-cold acetonitrile (total 15 cc.) and dried under reduced pressure (20 mm. Hg). The crystals thus isolated (8.0 g.) are dissolved in boiling acetonitrile (270 cc.), decolourising charcoal (0.2 g.) is added to the boiling solution and the whole is filtered. After twenty-four hours at 2°C., the crystals which have appeared are filtered off, washed three times with ice-cold acetronitrile (total 10 cc.) and dried under reduced presssure (20 mm. Hg). 5-(4-Methylpiperazin-1-yl)carbonyloxy-6-(1,8-naphthyridin-2-yl)-7-oxo-2,3,6,7-tetrahydro-1,4-dithiino[2,3-c]pyrrole (5.8 g.), melting at 255°C., is thus obtained.

Provenance & Evidence