title: Asymmetric synthesis of 2,3-dihydro-2-arylquinazolin-4-ones: methodology and application to a potent fluorescent tubulin inhibitor with anticancer activity.
abstract: For several decades the 2,3-dihydroquinazolinone (DHQZ) heterocycle has been known to possess a variety of important biological and medicinal properties. Despite the many interesting facets of these molecules, synthetic access to nonracemic DHQZ analogues has remained elusive. Herein, we disclose a synthetic route that allows access to either enantiomer of a variety of DHQZ derivatives. We illustrate the utility of this chemistry with the asymmetric preparation and biological evaluation of a new chiral fluorescent tubulin binding agent with extremely potent antiproliferative properties against human cancer cells. A computational rationale for the increased potency of the (S)-enantiomer over the (R)-enantiomer is given, based on the crystal structure of alpha,beta-tubulin complexed with colchicine. Taking advantage of the inherent fluorescence of these molecules, confocal images of GMC-5-193 (compound 7) in the cytoplasm of human melanoma cells (MDA-MB-435) cells are presented.
authors.affiliation: Department of Chemistry, UniVersity of Virginia, CharlottesVille, Virginia 22904, USA.
authors.forename: Gary M
authors.initials: GM
authors.lastname: Chinigo
authors.forename: Mikell
authors.initials: M
authors.lastname: Paige
authors.forename: Scott
authors.initials: S
authors.lastname: Grindrod
authors.forename: Ernest
authors.initials: E
authors.lastname: Hamel
authors.forename: Sivanesan
authors.initials: S
authors.lastname: Dakshanamurthy
authors.forename: Maksymilian
authors.initials: M
authors.lastname: Chruszcz
authors.forename: Wladek
authors.initials: W
authors.lastname: Minor
authors.forename: Milton L
authors.initials: ML
authors.lastname: Brown
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D018360:Crystallography, X-Ray; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D006859:Hydrogen / Q000737:chemistry*; D015394:Molecular Structure; D011485:Protein Binding; D011799:Quinazolines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D014404:Tubulin / Q000737:chemistry / Q000378:metabolism; D050257:Tubulin Modulators / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D005456:Fluorescent Dyes; D011799:Quinazolines; D014404:Tubulin; D050257:Tubulin Modulators; D006859:Hydrogen