Synthesis, NMR and crystal characterization of dimeric terephthalates derived from epimeric 4,5-seco-cholest-3-yn-5-ols
作者:Carlos Alarcón-Manjarrez、Rafael Arcos-Ramos、Marcos Flores Álamo、Martín A. Iglesias-Arteaga
DOI:10.1016/j.steroids.2016.03.001
日期:2016.5
Two dimeric steroidal terephthalates derivedfrom epimeric 4,5-seco-cholest-3-yn-5-ols were prepared starting from cholesterol in a five-step synthetic sequence. X-ray crystallography shows that the obtained compounds display novel supramolecular networks in the solid state in which the facial hydrophobicity of the steroidal skeletons plays an important role. Unambiguous NMR characterization of the
Unexpected cyclisation of an acetylenic acetal: vinyl cation capture by internally transferred hydride
作者:David Keirs、Karl Overton、Krishan Thakker
DOI:10.1039/c39900000310
日期:——
The acetylenicacetal (2) is converted in 90% yield to a mixture of cholesta-3,5- and 4,6-dienes on reflux in toluene containing toluene-p-sulphonic acid.
Palladium catalyzed synthesis of benzannulated steroid spiroketals
作者:Martha C. Mayorquín-Torres、Juan Carlos González-Orozco、Marcos Flores-Álamo、Ignacio Camacho-Arroyo、Martín A. Iglesias-Arteaga
DOI:10.1039/c9ob02255d
日期:——
by palladium catalyzed spiroketalization of 5α and 5β-alkynediols derived from testosterone, diosgenin and cholesterol. The regioselectivity of the spiroketalization reaction is decisively influenced by the α or β-orientation of the hydroxyl group at C-5. NMR and single crystal X-ray diffraction corroborated the structure of the obtained compounds. Compounds bearing a cholestane skeleton exhibited higher
Synthesis and Characterization of Hybrid Dimeric Steroid Spiroketals
作者:Martín A. Iglesias-Arteaga、Martha C. Mayorquín-Torres、Mauricio Maldonado-Domínguez、Marcos Flores-Álamo
DOI:10.1055/a-1647-7610
日期:2022.2
The synthesis of six dimeric spiroketals bearing an estradiol half fused to the 5α- or 5β-epimers of androstane, cholestane, and spirostane nuclei is described. The synthetic procedure comprises the Sonogashira coupling of different steroid alkynes with 2-iodoestradiol 17-monoacetate, followed by Pd-catalyzed spiroketalization. The structural characterization of the obtained hybrid dimers was performed
Synthesis of Dimeric Steroid Trioxabispiroacetals Scaffolds by Gold(I)-Catalyzed Hydroalkoxylation-Hydration of Diynediols
作者:Ricardo M. Valdez-García、Carlos Alarcón-Manjarrez、Annia Galano、Braulio Rodríguez-Molina、Marcos Flores-Álamo、Martín A. Iglesias-Arteaga
DOI:10.1002/ejoc.201900860
日期:2019.8.15
Dimers in which the steroid cores are bridged by a 6,5,6‐trioxabispiroacetal moiety were synthesized by a gold(I)‐catalyzed hydroalkoxylation‐hydration of steroid diynediols. X‐ray diffraction revealed a V‐shaped structure and a crystalline array with interconnected voids, resulting in channels.