Catalytic Enantioselective Conjugate Addition of 1,3-Dicarbonyl Compounds to Nitroalkenes
作者:Jianguo Ji、David M. Barnes、Ji Zhang、Steven A. King、Steven J. Wittenberger、Howard E. Morton
DOI:10.1021/ja992314w
日期:1999.11.1
Development of a Catalytic Enantioselective Conjugate Addition of 1,3-Dicarbonyl Compounds to Nitroalkenes for the Synthesis of Endothelin-A Antagonist <b>ABT-546</b>. Scope, Mechanism, and Further Application to the Synthesis of the Antidepressant Rolipram
作者:David M. Barnes、Jianguo Ji、Michael G. Fickes、Michael A. Fitzgerald、Steven A. King、Howard E. Morton、Frederick A. Plagge、Margo Preskill、Seble H. Wagaw、Steven J. Wittenberger、Ji Zhang
DOI:10.1021/ja026788y
日期:2002.11.1
The enantioselectivesynthesis of endothelin-A antagonist ABT-546 has been accomplished via the discovery and development of a highly selective catalyticasymmetricconjugateaddition of ketoesters to nitroolefins. Employing just 4 mol % bis(oxazoline)-Mg(OTf)(2) complex with an amine cocatalyst, we obtained the product nitroketone with 88% selectivity at the aryl-bearing stereocenter and in good yield