An efficient, overall enantioselective variant of the Hantzsch synthesis of 4-aryl-1,4-dihydropyridines (ee = 84 - 98%), important biologically active compounds (e. g. as calcium channel blockers), is described. Key step of the new procedure is the asymmetric Michael addition of metalated chiral alkyl acetoacetate hydrazones ()- to the Knoevenagel acceptors . An accurate method to determine the enantiomeric
描述了4-芳基-1,4-
二氢吡啶(ee = 84-98%)(重要的
生物活性化合物(例如,作为
钙通道阻滞剂))的汉茨合成的有效的整体对映选择性变体。新方法的关键步骤是将
金属化手性烷基
乙酰乙酸()-不对称迈克尔加成到Knoevenagel受体上。还报道了确定手性
二氢吡啶的对映体过量的准确方法。