作者:Rémi Andres、Qian Wang、Jieping Zhu
DOI:10.1002/anie.202301517
日期:——
The unprecedented 8-alkyl octahydro-2H-5,8-methanofuro[2,3-b]azepin-8-ium motif was generated by intramolecular nucleophilic addition of the tertiary amine nitrogen atom to the oxonium generated in situ from a hemiacetal. A squaramide-catalyzed enantioselective Pictet–Spengler reaction of an α-ketoester was used to control the C1 configuration of the 1,1-disubstituted tetrahydro-β-carboline.
前所未有的 8-烷基八氢-2 H -5,8-甲烷呋喃[2,3- b ]azepin-8-ium 基序是通过将叔胺氮原子分子内亲核加成到由半缩醛原位生成的氧鎓而产生的。α-酮酯的方酸酰胺催化的对映选择性 Pictet-Spengler 反应用于控制 1,1-二取代四氢-β-咔啉的 C1 构型。