A process for the preparation of olanzapine

摘要

The invention relates to the process for the preparation of antipsychotic medicament olanzapine which comprises the reaction of anhydrous piperazine with 4-amino-2-methyl-10H-thieno[2.3- b ][1.5]-benzodiazepine or its inorganic acid addition salt carried out in molten piperazine in the absence of a solvent, and then N-methylation of N-demethylolanzapine thus obtained to form olanzapine.