Process for the preparation of pyrazolo[4,3-d]pyrimidin-7-one compounds and intermediates thereof

摘要

A process is provide for the preparation of compounds of formula (I) hereincomprising reacting a compound of formula (III), (IV) or (V)wherein the variables are as defined in the specification. The reaction is conducted in the presence of <->OR<3 >and a hydroxide trapping agent or in the case of compounds of formula (IV) reacting in the presence of an auxiliary base and a hydroxide trapping agent.