Chemical synthesis of tetracyclic terpenes and evaluation of antagonistic activity on endothelin-A receptors and voltage-gated calcium channels
作者:Jianyu Lu、Angelo Aguilar、Bende Zou、Weier Bao、Serkan Koldas、Aibin Shi、John Desper、Philine Wangemann、Xinmin Simon Xie、Duy H. Hua
DOI:10.1016/j.bmc.2015.06.055
日期:2015.9
A class of tetracyclic terpenes was synthesized and evaluated for antagonistic activity of endothelin-1 (ET-1) induced vasoconstriction and inhibitory activity of voltage-activated Ca2+ channels. Three repeated Robinson annulation reactions were utilized to construct the tetracyclic molecules. A stereoselective reductive Robinson annulation was discovered for the formation of optically pure tricyclic
A total synthesis of C-nor D-homosteroids of the A → B → C → D type, involving a reductive alkylation step for construction of the d-ring
作者:Erie Brown、Jacques Lebreton
DOI:10.1016/s0040-4039(00)84593-1
日期:1986.1
A stereospecifictotalsynthesis of the racemic C-nor D-homosteroid compound , which has six asymmetric carbons and which presents the natural -- configuration, was carried out in twelve steps starting from the Wieland-Miescher ketone .
Une synthese totale stereospecifique de c-nor d-homosteroides comportant six carbones asymetriques
作者:Eric Brown、Jacques Lebreton
DOI:10.1016/s0040-4020(01)87789-9
日期:——
An efficient and stereoselective total synthesis of C-nor D-homosteroid compounds is described, following a general pathway of the A→B→C→D type. The A-B ring system was provided by the Wieland-Miescher ketone . the ringC was formed by intramolecular cyclisation of an appropiate γ-diketone such as . Construction of the ringD was achieved by means of a Birch reductive alkylattion, followed by intramolecular
Studies towards a total synthesis of the antiprogestine onapristone
作者:Valentin S. Enev、Orlin S. Petrov、Harribert Neh、Klaus Nickisch
DOI:10.1016/s0040-4020(97)00934-4
日期:1997.10
Starting from the readily available Eder-Hajosh ketone 2 a stereoselective method for synthesis of arylated hydrindenone 14 was developed. One pot Li/NH3 reduction and trapping of the generated enolate with activated Michael acceptor gave a properly substituted BCD-ring precursor 22. Attempted B ring closure with the model compound 22 failed under various conditions. (C) 1997 Elsevier Science Ltd.