Process for the preparation of donepezil

   
   

The invention provides a process for the preparation of a compound of the formula 6 comprising the hydrolysis and decarboxylation of a compound of the formula 5 according to the reaction: ##STR1## wherein R and R.sub.2 independently a C.sub.1 -C.sub.4 alkyl group or an aralkyl group.

La invención proporciona un proceso para la preparación de un compuesto del fórmula 6 que abarca la hidrólisis y el decarboxylation de un compuesto del fórmula 5 según la reacción: ## del ## STR1 en donde R y R.sub.2 independientemente un C.sub.1 - grupo alkyl C.sub.4 o un grupo del aralkyl.

 
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