Atropisomeric lactam chemistry: catalytic enantioselective synthesis, application to asymmetric enolate chemistry and synthesis of key intermediates for NET inhibitors
作者:Masashi Takahashi、Hajime Tanabe、Tsuyoshi Nakamura、Daisuke Kuribara、Toshiyuki Yamazaki、Osamu Kitagawa
DOI:10.1016/j.tet.2009.10.095
日期:2010.1
enantioselective manner (89–98% ee) to give optically active atropisomeric lactams having an N–C chiral axis. MPLC purification of the enantio-enriched lactam products using an achiral silica gel column led to a further increase in the enantiomeric purity (>99% ee). The reaction of the lithium enolate prepared from the optically active atropisomeric lactam with various alkyl halides gave α-substituted and
在(存在- [R)-SEGPHOS -钯(OAC)2催化剂中,分子内Ñ的-arylation邻-叔具有碘苯基的丁基丁基-NH-苯胺以高度对映选择性的方式(89-98%ee)进行反应,得到具有NC手性轴的旋光性阻转异构内酰胺。使用非手性硅胶色谱柱对富含对映体的内酰胺产物进行MPLC纯化可进一步提高对映体纯度(> 99%ee)。由旋光性阻转异构内酰胺制备的烯醇锂与各种烷基卤化物的反应得到具有高非对映选择性的α-取代的和α,α-二取代的内酰胺产物。α-烷基化内酰胺衍生物被有效地转化为合成NET抑制剂的关键中间体。