IBX-mediated oxidative addition of isocyanides to cyclic secondary amines: total syntheses of alangiobussine and alangiobussinine
作者:Mayur D. Ambule、Shashank Tripathi、Anirban Ghoshal、Ajay K. Srivastava
DOI:10.1039/c9cc05215a
日期:——
activate imine facilitating isocyanide addition. Detailed mechanistic investigations were performed by isotopic labeling and real-time NMR experiments. The method was utilized for the gram scale syntheses of two alkaloids alangiobussine and alangiobussinine in 63% and 45% overall yield, respectively.
本研究描述了一种通过IBX介导的异氰酸酯向色氨酸和1,2,3,4-四氢异喹啉的氧化加成反应合成C(1)-羧酰胺的稳健而通用的方法。在这种转化中,IBX扮演氧化剂和路易斯酸的双重角色,以激活亚胺促进异氰酸酯的添加。通过同位素标记和实时NMR实验进行了详细的机理研究。该方法被用于两种生物碱类langobussine和langobussinine的克级合成,总收率分别为63%和45%。