title: Nucleophilic addition to the ethynyl group in ethynylestradiol catalyzed by crown ether-copper (1) iodide.
abstract: A new and convenient synthetic route to acetylation of estrogens is described. Benzo-15-crown-5 and cuprous iodide-mixed catalyst catalyzed the nucleophilic addition of 2,4-dibromoethynylestradiol, resulting in the formation of a new compound, 2,4-dibromo-17 alpha-acetylestradiol, of which the structure was characterized by infrared, UV, 1H nuclear magnetic resonance, mass spectra, and elemental analysis. It was found that the yield of this approach is much higher than that obtained in the hydration of usual acetylenic compounds.
authors.affiliation: Department of Chemistry, Sichuan University, Chengdu, PR China.
authors.forename: S H
authors.initials: SH
authors.lastname: Chen
authors.forename: G R
authors.initials: GR
authors.lastname: Luo
authors.forename: X Z
authors.initials: XZ
authors.lastname: Chang
authors.forename: H M
authors.initials: HM
authors.lastname: Zhao
mesh_terms: D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004958:Estradiol / Q000031:analogs & derivatives / Q000138:chemical synthesis; D004987:Ethers / Q000737:chemistry*; D004997:Ethinyl Estradiol / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000737:chemistry*; D007454:Iodides / Q000737:chemistry*; D015394:Molecular Structure
chemical_list: D004987:Ethers; D007454:Iodides; C073871:2,4-dibromo-17-acetylestradiol; D004997:Ethinyl Estradiol; D004958:Estradiol; D003300:Copper; C063266:2,4-dibromo-17-ethynyl(6,7)estradiol; C073870:cuprous iodide