Sodium hydride → HCID 21527037, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of sodium hydride (1.11 g.) in anhydrous tetrahydrofuran (120 cc.) is treated for 20 minutes at about 10°-15° C. with 6-(5-chloropyrid-2-yl)-5-hydroxy-7-oxo-2,3,6,7-tetrahydro-1,4-dithiino[2,3-c]pyrrole (11.6 g.), and a solution of 1-chlorocarbonyl-4-ethylpiperazine (20.4 g.) in anhydrous tetrahydrofuran (160 cc.) is then added, at 5° C. The reaction mixture is stirred for 4 hours at 5° C. After evaporating the solvent under reduced pressure (20 mm. Hg), the residue is dissolved in diethyl ether (400 cc.). The ether solution is washed twice with ice-cold normal sodium hydroxide solution (total 300 cc.) and three times with distilled water (total 300 cc.), treated with decolourising charcoal (0.2 g.), dried over anhydrous sodium sulphate, filtered and evaporated. The residue (13.8 g.; m.p. 140° C.) is dissolved in boiling ethanol (25 cc.). After cooling for 3 hours at 2° C, the crystals which have appeared are filtered off, washed twice with ice-cold ethanol (total 20 cc.) and dried under reduced pressure (20 mm. Hg). 6-(5-Chloropyrid-2-yl)-5-(4-ethylpiperazin-1-yl)carbonyloxy-7-oxo-2,3,6,7-tetrahydro-1,4-dithiino[2,3-c]pyrrole (4.9 g.), melting at 163° C, is thus obtained.

Provenance & Evidence