title: Design, synthesis and biological activities of novel oxazolo[4,5-g]quinazolin-2(1H)-one derivatives as EGFR inhibitors.
abstract: A series of oxazolo[4,5-g]quinazolin-2(1H)-one derivatives employing Erlotinib as lead compound were synthesized and evaluated for their EGFR inhibition activity. These compounds having variation at the 1 and 8-position, included ether and esters hydrophilic side-chain and aromatic head fragment, respectively. All these compounds were evaluated by EGFR inhibition and two anti-proliferation assays in vitro. Four compounds were found more potent than Erlotinib in EGFR-TK assay. Furthermore, compounds 18, 42 and 50 also had good to excellent anti-proliferation activity against human epidermoid cancer cell line (KB) and renal cell carcinoma cell line (A498). Finally, compound 50 presented remarkably higher inhibition efficacy towards tumor growth than Erlotinib in a mouse lewis lung cancer (LLC) xenograft model. Furthermore, compound 50 displayed the most distinguished effect on extending the survival period of the tumor-bearing mice.
authors.affiliation: State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, Center of Drug Discovery, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, Center of Drug Discovery, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China.
authors.forename: Liliang
authors.initials: L
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, Center of Drug Discovery, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China.
authors.forename: Jinsheng
authors.initials: J
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, Center of Drug Discovery, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China. Electronic address: xuelingjing65@163.com.
authors.forename: Lingjing
authors.initials: L
authors.lastname: Xue
authors.affiliation: State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, Center of Drug Discovery, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China. Electronic address: zhangcan@cpu.edu.cn.
authors.forename: Can
authors.initials: C
authors.lastname: Zhang
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*; D001583:Benzoxazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D015195:Drug Design; D004354:Drug Screening Assays, Antitumor; D066246:ErbB Receptors / Q000037:antagonists & inhibitors* / Q000378:metabolism; D006801:Humans; D051379:Mice; D016513:Mice, SCID; D009374:Neoplasms, Experimental / Q000188:drug therapy / Q000473:pathology; D011799:Quinazolines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D000970:Antineoplastic Agents; D001583:Benzoxazoles; D011799:Quinazolines; C000607742:ethyl 4-(8-(3-hydroxyphenylamino)-2-oxooxazolo(4,5-g)quinazolin-1(2H)-yl)butanoate; D066246:ErbB Receptors
keywords: Docking; EGFR inhibitor; Oxazolo[4,5-g]quinazolin-2(1H)-one scaffold; Protein tyrosine kinases (PTK); SAR