Asymmetric Synthesis of 3-Substituted Dihydro-2<i>H</i>-isoquinolin-1-ones, Dihydro- and Tetrahydroisoquinolines via 1,2-Addition/Ring Closure
作者:Dieter Enders、Volker Braig、Marine Boudou、Gerhard Raabe
DOI:10.1055/s-2004-834861
日期:——
The asymmetric synthesis of 3-substituted dihydro-2H-isoquinolin-1-ones, dihydro- and tetrahydroisoquinolines is described. The key operation is a tandem 1,2-addition/ring closure sequence employing lithiated ortho-toluamides and aldehyde SAMP-or RAMP-hydrazones as substrates, followed by N-N bond cleavage to remove the auxiliary. Moderate to good yields and high enantiomeric excesses (ee = 85-99%)
描述了 3-取代二氢-2H-异喹啉-1-酮、二氢和四氢异喹啉的不对称合成。关键操作是串联 1,2-加成/闭环序列,使用锂化邻甲苯酰胺和醛 SAMP-或 RAMP-腙作为底物,然后进行 NN 键断裂以去除辅助剂。达到中等至良好的产率和高对映体过量(ee = 85-99%)。