Impureza N-Isopropyl-2-(3-(4-oxo-4,4a-dihydroquinazolin-2-yl)phenoxy)acetamide (CAS 2121561-39-3) é um subproduto processual observado em rotas sintéticas que envolvem alquilação e formação da unidade quinazolinona, originando-se por reações secundárias como acilação incompleta ou rearranjos durante a etapa fenoxila; quimicamente definida como acetamida fenoxila com núcleo 3,4-dihidro-4-oxo-2-quinazolinil, esta impureza pode comprometer a pureza e o perfil de estabilidade do material final, exigindo monitoramento analítico rigoroso; sua identificação e quantificação são realizadas por HPLC com detecção UV e LC-MS para confirmação de massa, complementadas por RMN para elucidação estrutural, e recomenda-se validação de métodos e estabelecimento de limites de especificação para controle em desenvolvimento e produção.
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