Fully Stereocontrolled Syntheses of 3-Oxacarbacyclin and Carbacyclin by the Conjugate Addition-Azoalkene-Asymmetric Olefination Strategy
作者:Mikhail Kim、Hans-Joachim Gais
DOI:10.1021/jo060551t
日期:2006.6.1
described. The syntheses are based on the conjugate addition-azoalkene-asymmetric olefination strategy. Its key features are (1) the stereoselective establishment of the complete ω-side chain of 2 and 3 through conjugate addition of the enantiopure C13−C20 alkenylcopper derivative 10 to the enantiopure C6−C12 bicyclic azoalkene 9 and (2) the 5E-stereoselective construction of the α-side chain through a Hor
Asymmetric Synthesis of 3-Oxa-15-deoxy-16-(m-tolyl)-17,18,19,20-tetranorisocarbacyclin and Its Neuroprotective Analogue 15-Deoxy-16-(m-tolyl)-17,18,19,20-tetranorisocarbacyclin Based on the Conjugate Addition–Azoalkene–Asymmetric Olefination Strategy
作者:Marc van de Sande、Hans-Joachim Gais
DOI:10.1002/chem.200600728
日期:2007.2.12
and 7 b are based on the convergent conjugate addition-azoalkene-asymmetric olefination strategy. Key building blocks are the readily available bicyclic azoalkene 14 and the alkenylcopper derivative 15. The stereoselective conjugate addition of 15 to 14 gave hydrazone 13, which was stereoselectively converted to the bicyclic ketone 11. The key steps for the construction of the alpha sidechain of 7