Serial Radical Cyclization of Pyranose-Derived Dienes in the Stereocontrolled Synthesis of Densely Functionalized Cyclohexanes. A Route to Woodward's Reserpine Precursor
摘要:
Serial radical 5-exo/6-exo cyclizations of a readily prepared hexopyranose derivative having unsaturations on-template at C-2 and off-template at C-7 lead to a tricyclic cage in which all but one of the stereocenters in an optically pure form of Woodward's densely functionalized carbocyclic precursor have been established, the ''one'' requiring an hydroxyl epimerization.
Serial Radical Cyclization of Pyranose-Derived Dienes in the Stereocontrolled Synthesis of Densely Functionalized Cyclohexanes. A Route to Woodward's Reserpine Precursor
摘要:
Serial radical 5-exo/6-exo cyclizations of a readily prepared hexopyranose derivative having unsaturations on-template at C-2 and off-template at C-7 lead to a tricyclic cage in which all but one of the stereocenters in an optically pure form of Woodward's densely functionalized carbocyclic precursor have been established, the ''one'' requiring an hydroxyl epimerization.