Dimethyl Sulfoxide → Olanzapine

Participants

Reaction Conditions

Reaction Steps

4-Amino-2-methyl-10H-thieno[2,3-b][1,5]benzodiazepine, hydrochloride (100 g) was refluxed in a mixture of N-methylpiperazine (349 mL), dimethylsulphoxide (465 mL) and toluene (465 mL) under a nitrogen atmosphere for 20 hours. The mixture was cooled to 50° C., and water (465 mL) was added at 50-55° C. in 20 min. Then the reaction mass was cooled to 5° C. and stirred for 2 h. The product was filtered and washed with water (100 mL, 20° C.). Dried the product at 60-70° C. under reduced pressure to give crude 2-Methyl-4-(4-methyl-1-piperazinyl)-10H-thieno[2,3-b][1,5]benzodiazepine or Olanzapine.

Provenance & Evidence