Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. Its structure allows for selective substitution at multiple sites, making it valuable in medicinal chemistry for creating targeted therapies. Commonly employed in the preparation of antitumor agents due to its ability to modulate biological pathways involved in cell proliferation. Also utilized in research settings to develop novel quinazoline-based drugs with improved efficacy and selectivity.