The Hancock Alkaloids (−)-Cuspareine, (−)-Galipinine, (−)-Galipeine, and (−)-Angustureine: Asymmetric Syntheses and Corrected <sup>1</sup>H and <sup>13</sup>C NMR Data
作者:Stephen G. Davies、Ai M. Fletcher、Ian T. T. Houlsby、Paul M. Roberts、James E. Thomson、David Zimmer
DOI:10.1021/acs.jnatprod.8b00672
日期:2018.12.28
(-)-angustureine were prepared in overall yields of 30%, 28%, 15%, and 39%, respectively, in nine steps from commercially available 3-( o-bromophenyl)propanoic acid in all cases. Unambiguously corrected 1H and 13C NMR data for the originally isolated samples of (-)-cuspareine, (-)-galipinine, and (-)-angustureine are also reported, representing a valuable reference resource for these popular synthetic
描绘了基于2-取代的N-甲基-1,2,3,4-四氢喹啉核心的汉考克生物碱家族的所有成员的不对称合成。将对映体纯的N-苄基锂-N-(α-甲基-对甲氧基苄基)酰胺共轭添加到5-(邻溴苯基)-N-甲氧基-N-甲基戊-2-烯酰胺中以生成必要的C- 2立体定向的目标,而分子内布赫瓦尔德-哈特维格偶联是用来形成1,2,3,4-四氢喹啉环。后期多样化完成了C-2侧链的构建。因此,分九步制备(-)-cuspareine,(-)-galipinine,(-)-galipeine和(-)-angustureine的总产率分别为30%,28%,15%和39%在所有情况下均由市售的3-(邻-溴苯基)丙酸制成。