title: Molecular modeling studies and synthesis of novel quinoxaline derivatives with potential anticancer activity as inhibitors of c-Met kinase.
abstract: In an effort to develop potent anti-cancer agents, we have synthesized some substituted quinoxaline derivatives. Reaction of 6-bromo-3-methylquinoxalin-2(1H)-one 1 with aromatic aldehydes furnished the styryl derivatives 2a-e. Alkylation of 1 with ethyl chloroacetate produced the N-alkyl derivatives 3. Hydrazinolysis of the ester derivative 3 with hydrazine hydrate afforded the hydrazide derivative 4. In addition, chlorination of 1 with phosphorus oxychloride afforded the 2-chloro derivative 5 which was used as a key intermediate for the synthesis of substituted quinoxaline derivatives 6-8, N-pyrazole derivative 9, tetrazolo[1,5-a]quinoxaline derivative 10 and Schiff base derivatives 13, 15 via reaction with several nucleophiles reagents. Docking methodologies were used to predict their binding conformation to explain the differences of their tested biological activities. All the tested compounds were screened in vitro for their cytotoxic effect on three tumor cell lines. Some new quinoxaline derivatives were studied as inhibitors of c-Met kinase, a receptor associated with high tumor grade and poor prognosis in a number of human cancers. Compounds 2e, 4, 7a, 12a, 12b and 13 showed the highest binding affinity with CDOCKER energy score, while showed the lowest IC50 values against three types of cancer cell lines. It is worth to mention that, compounds 2e, 7a, 12b and 13 showed comparable inhibition activity to the reference drug, while compounds 4 and 12a showed a more potent inhibition activity than Doxorubicin.
authors.affiliation: Photochemistry Department, National Research Centre, 12622 Doki, Cairo, Egypt; Department of Chemistry, Faculty of Science, King Khaled University, Abha, Saudi Arabia. Electronic address: hebanrc@yahoo.com.
authors.forename: Hebat-Allah S
authors.initials: HA
authors.lastname: Abbas
authors.affiliation: Department of Chemistry, Faculty of Science, King Khaled University, Abha, Saudi Arabia; Department of Chemistry, University College in Qunfudah, Umm Al Qura University, Qunfudah, Saudi Arabia.
authors.forename: Aisha R
authors.initials: AR
authors.lastname: Al-Marhabi
authors.affiliation: Pharmaceutical Chemistry Department, Faculty of pharmacy, Al-Azhar University, Cairo, Egypt.
authors.forename: Sally I
authors.initials: SI
authors.lastname: Eissa
authors.affiliation: Department of Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt.
authors.forename: Yousry A
authors.initials: YA
authors.lastname: Ammar
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D061986:MCF-7 Cells; D008958:Models, Molecular; D015394:Molecular Structure; D047428:Protein Kinase Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D019859:Proto-Oncogene Proteins c-met / Q000037:antagonists & inhibitors* / Q000378:metabolism; D011810:Quinoxalines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D000970:Antineoplastic Agents; D047428:Protein Kinase Inhibitors; D011810:Quinoxalines; D019859:Proto-Oncogene Proteins c-met
keywords: Anticancer; Molecular modeling; Quinoxaline; c-Met kinase