title: Synthesis and anti-breast cancer activities of substituted quinolines.
abstract: Promising anti-breast cancer agents derived from substituted quinolines were discovered. The quinolines were readily synthesized in a large scale from a sequence of reactions starting from 4-acetamidoanisole. The Michael addition product was isolated as the reaction intermediate in the ring closing reaction of 4-amino-5-nitro-2-(3-trifluoromethylphenyloxy)anisole with methyl vinyl ketone leading to 6-methoxy-4-methyl-8-nitro-5-(3-trifluoromethylphenyloxy)quinoline (14). The amino function of 8-amino-6-methoxy-4-methyl-5-(3-trifluoromethylphenyloxy)quinoline, prepared from 14, was connected to various side chains via alkylation with N-(3-iodopropyl)phthalimide, Michael addition with acrylonitrile, and reductive amination with various heterocycle carboxaldehydes, such as imidazole-4-carboxaldehyde, thiophene-2-carboxaldehyde, and 2-furaldehyde. Effects of the substituted quinolines on cell viability of T47D breast cancer cells using trypan blue exclusion assay were examined. The results showed that the IC(50) value of 6-methoxy-8-[(2-furanylmethyl)amino]-4-methyl-5-(3-trifluoromethylphenyloxy)quinoline is 16+/-3nM, the lowest IC(50) out of all the quinolines tested. IC(50) values of three other quinolines are in the nanomolar range, a desirable range for pharmacological testing.
authors.affiliation: Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Aibin
authors.initials: A
authors.lastname: Shi
authors.forename: Thu A
authors.initials: TA
authors.lastname: Nguyen
authors.forename: Srinivas K
authors.initials: SK
authors.lastname: Battina
authors.forename: Sandeep
authors.initials: S
authors.lastname: Rana
authors.forename: Dolores J
authors.initials: DJ
authors.lastname: Takemoto
authors.forename: Peter K
authors.initials: PK
authors.lastname: Chiang
authors.forename: Duy H
authors.initials: DH
authors.lastname: Hua
mesh_terms: D000634:Aminoquinolines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000188:drug therapy*; D020650:Combinatorial Chemistry Techniques; D003500:Cyclization; D004354:Drug Screening Assays, Antitumor; D005260:Female; D006801:Humans; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D011804:Quinolines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: C585813:6-methoxy-8-((2-furanylmethyl)amino)-4-methyl-5-(3-trifluoromethylphenyloxy)quinoline; D000634:Aminoquinolines; D011804:Quinolines