<i>aza</i>-Prins-pinacol Approach to 7-Azabicyclo[2.2.1]heptanes and Ring Expansion to [3.2.1]Tropanes
作者:Alan Armstrong、Stephen E. Shanahan
DOI:10.1021/ol0501267
日期:2005.3.1
[reaction: see text] The 7-azabicyclo[2.2.1]heptane ring system can be rapidly accessed from 5-(1-hydroxyallyl)-2-alkoxy-N-tosylpyrrolidines via an unusual aza-Prins-pinacol reaction mediated by Lewis acid. The products can undergo ring expansion to isomeric tropanones. These reactions show promise for a concise entry to biologically relevant azabicyclic targets.
[反应:参见正文]通过路易斯介导的不寻常的aza-Prins-频哪醇反应,可以从5-(1-羟基烯丙基)-2-烷氧基-N-甲苯磺酰基吡咯烷快速访问7-氮杂双环[2.2.1]庚烷环系统酸。产物可经历扩环成异构的对苯二酮。这些反应显示出对生物学相关的氮杂双环靶标的简洁进入的希望。