The pyranose 4 yielded the 2-oxa-8-aza-bicyclo [3.3.1] nonane 14 by condensation with tryptamine 7; the intermediate acyliminium 18 led to the expected 2β-H-indoloquinolizidinone 15ab through a Pictet-Spengler cyclisation.
吡喃糖4通过与
色胺7缩合而产生2-氧杂-8-
氮杂双环[3.3.1]
壬烷14。中间的acyliminium 18通过Pictet-Spengler环化反应产生了预期的2β-H-
吲哚并
喹喔啉酮15ab。