Enantioselective hantzsch dihydropyridine synthesis via metalated chiral alkyl acetoacetate hydrazones1
作者:Dieter Enders、Stephan Müller、Ayhan S. Demir
DOI:10.1016/s0040-4039(00)82366-7
日期:1988.1
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。