Oxalic acid dihydrate → HCID 21481141, compound

Participants

Reaction Conditions

Reaction Steps

750 mg of 3-[2-[4-(2-chloro-dibenzo[b,f]thiepin-10-yl)-1-piperazinyl]-ethyl]-2-oxazolidinone, 0.6 g of sodium borohydride and 30 ml of diglyme are treated dropwise under an argon atmosphere at 20°-30° C over a period of 15 minutes with 2.7 g of oxalic acid dihydrate in 15 ml of diglyme. The mixture is heated for 4 hours at an internal temperature of 100° C and subsequently evaporated under reduced pressure. The residue is treated with chloroform and 2-N sodium hydroxide solution. After equilibration, the aqueous phase is separated and washed twice with chloroform. The combined chloroform extracts are washed with water, dried over potassium carbonate and active carbon, filtered and evaporated under reduced pressure. There is obtained 3-[2-[4-(2-chloro-10,11-dihydro-dibenzo[b,f]thiepin-10-yl)-1-piperazinyl]-ethyl]-2-oxazolidinone in the form of a brown oil. The maleate of melting point 173°-175° C is prepared by treatment with maleic acid in ethanol/ether.

Provenance & Evidence