Method of manufacture of alanzapine, new derivative of N-demethyl olanzapine and method of manufacture of new derivative of N-demethyl olanzapine

摘要

The invention relates to a process for the preparation of olanzapine and to a new intermediate compound, 2-methyl-4-(4-formyl-1-piperazinyl)-10H-thieno[2,3-b][1,5]-benzodiazepine of formula III and a process for the preparation thereof.