Highly Enantioselective Synthesis of Atropisomeric Anilide Derivatives through Catalytic Asymmetric N-Arylation: Conformational Analysis and Application to Asymmetric Enolate Chemistry
作者:Osamu Kitagawa、Masatoshi Yoshikawa、Hajime Tanabe、Tomofumi Morita、Masashi Takahashi、Yasuo Dobashi、Takeo Taguchi
DOI:10.1021/ja064026n
日期:2006.10.1
enantioselectivity (88-96% ee) to give atropisomeric N-(p-nitrophenyl)anilides having an N-C chiral axis in good yields. Atropisomeric anilide products highly prefer to exist as the E-rotamer which has trans-disposed o-tert-butylphenyl group and carbonyl oxygen. The application of the present catalytic enantioselective N-arylation to an intramolecular version gives atropisomeric lactam derivatives with high
在 (R)-DTBM-SEGPHOS-Pd(OAc)(2) 催化剂存在下,各种邻叔丁基苯胺与对碘硝基苯的 N-芳基化(芳香胺化)以高对映选择性 (88-96% ee) 进行以良好的产率得到具有 NC 手性轴的阻转异构 N-(对硝基苯基)苯胺。阻转异构苯胺产品更倾向于以具有转位邻叔丁基苯基和羰基氧的 E-旋转异构体形式存在。将本催化对映选择性 N-芳基化应用于分子内形式得到具有高光学纯度 (92-98% ee) 的阻转异构内酰胺衍生物。由阻转异构苯胺和内酰胺产物制备的烯醇锂与各种卤代烷反应得到具有高非对映选择性(非对映异构体比 = 13:1 至 46:1)的 α-烷基化产物。