Eight alkaloids were isolated from the leaves of Alangium bussyanum, six of which were known, viz. tubulosine, 9-desmethyltubulosine, deoxydesmethyltubulosine, O-methyltubulosine, deoxytubulosine and 9- or 10-desmethylprotoemetinol. The two other alkaloids were new and their structures were established as alangiobussine and alangiobussinine by spectroscopic and chemical methods.
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.