Synthesis of Chiral Cyclic Nitrones by Asymmetric Addition of β-Ketosulfones to Nitroalkenes followed by Reductive Cyclization
作者:Olga García Mancheño、Pia Tangen、Renate Rohlmann、Roland Fröhlich、José Alemán
DOI:10.1002/chem.201001914
日期:2011.1.17
transformed into chiral nitrones by reduction of the nitro group and in situ cyclization (up to 99:1 e.r. and >98:2 d.r.). Moreover, the utility of this method has additionally been demonstrated by the further transformation to functionalized N‐hydroxypyrrolidines that possess a quaternary center by addition of trimethylsilyl cyanide (TMSCN) to the CN bond of the cyclic nitrones in the presence of a
介绍了硫脲金鸡纳生物碱催化的β-酮砜第一次有机催化加成至硝基烯烃。通过还原硝基和原位环化(高达99:1 er和> 98:2 dr),将容易获得的加成产物选择性转化为手性硝酮。此外,通过在路易斯酸存在下将三甲基甲硅烷基氰化物(TMSCN)加到环状硝酮的CN键上,进一步转化为具有季中心的官能化N-羟基吡咯烷,进一步证明了该方法的实用性。。