作者:Guolin Cheng、Xinyan Wang、Rui Zhu、Changwei Shao、Jimin Xu、Yuefei Hu
DOI:10.1021/jo200069m
日期:2011.4.15
synthesis of tropane alkaloids (−)-cocaine and (−)-ferruginine were accomplished in nine steps each and in 55% and 46% overall yields, respectively, starting from the known Betti base derivative (+)-(7aR,10R,12S)-10-(1H-benzotriazol-1-yl)-7a,8,9,10-tetrahydro-12-phenyl-12H-naphtho[1,2-e]pyrrolo[2,1-b][1,3]oxazine. In this novel route, RCM reaction and 1,3-dipolar cycloaddition were employed as key steps
从已知的Betti基础衍生物(+)-(7a R,10 R,12 S)-10-(1 H-苯并三唑-1-基)-7a,8,9,10-四氢-12-苯基-12 H-萘[1,2- e ]吡咯并[2,1- b ] [1,3]恶嗪。在该新颖途径中,RCM反应和1,3-偶极环加成被用作对映烷骨架的对映选择性构建和3-溴-2-异恶唑啉环的区域选择性引入作为掩蔽的顺式-2,3-二取代基的关键步骤。获得所需的前体(2 S,5R)-2-烯丙基-5-乙烯基吡咯烷用于RCM反应,我们开发了一种通用且实用的方法,用于制备带有烯键和/或炔烃取代基的对映体纯的顺式-2,5-二取代的吡咯烷。我们还提供了两种高效的途径,可将3-溴-2-异恶唑啉环转化为(-)-可卡因和(-)-铁精氨酸中所需的顺式-2,3-二取代基。