作者:Albert Padwa、Alex G. Waterson
DOI:10.1021/jo991414h
日期:2000.1.1
six-membered alkylthio-substituted lactams as transient intermediates. Further reaction of the alkylthio-substituted lactam with DMTSF generates an N-acyliminium ion, which undergoes cyclization with the tethered aromatic ring to produce an azapolycyclic ring system. Related cyclization sequences occur when amido thioacetals possessing simple olefinic tethers were used. The overall procedure represents an efficient
用四氟硼酸二甲基(甲硫基)ulf(DMTSF)处理几种酰胺基取代的硫缩醛会产生可合成使用的硫鎓离子,该硫鎓离子会被相邻的氮原子拦截,从而提供五元和六元烷硫基取代的内酰胺,作为过渡中间体。烷硫基取代的内酰胺与DMTSF的进一步反应生成N-酰亚胺离子,该N-酰亚胺离子与束缚的芳环进行环化反应,生成氮杂多环系统。当使用具有简单烯烃链的酰胺基硫缩醛时,会发生相关的环化序列。整个过程代表了一种针对各种含氮环系统的高效一锅法。环化反应用于赤藓生物碱家族核心骨架的合成。