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Design and Synthesis of Novel Human Epidermal Growth Factor Receptor 2 (HER2)/Epidermal Growth Factor Receptor (EGFR) Dual Inhibitors Bearing a Pyrrolo[3,2-d]pyrimidine Scaffold

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journal contribution
posted on 08.12.2011, 00:00 by Tomoyasu Ishikawa, Masaki Seto, Hiroshi Banno, Youichi Kawakita, Mami Oorui, Takahiko Taniguchi, Yoshikazu Ohta, Toshiya Tamura, Akiko Nakayama, Hiroshi Miki, Hidenori Kamiguchi, Toshimasa Tanaka, Noriyuki Habuka, Satoshi Sogabe, Jason Yano, Kathleen Aertgeerts, Keiji Kamiyama
Dual inhibitors of human epidermal growth factor receptor 2 (HER2) and epidermal growth factor receptor (EGFR) have been investigated for breast, lung, gastric, prostate, and other cancers; one, lapatinib, is currently approved for breast cancer. To develop novel HER2/EGFR dual kinase inhibitors, we designed and synthesized pyrrolo­[3,2-d]­pyrimidine derivatives capable of fitting into the receptors’ ATP binding site. Among the prepared compounds, 34e showed potent HER2 and EGFR (HER1) inhibitory activities as well as tumor growth inhibitory activity. The X-ray cocrystal structures of 34e with both HER2 and EGFR demonstrated that 34e interacts with the expected residues in their respective ATP pockets. Furthermore, reflecting its good oral bioavailability, 34e exhibited potent in vivo efficacy in HER2-overexpressing tumor xenograft models. On the basis of these findings, we report 34e (TAK-285) as a promising candidate for clinical development as a novel HER2/EGFR dual kinase inhibitor.