Synthesis of the aspidosperma skeleton through allylsilane N-acyliminium cyclization
作者:John Mittendorf、Henk Hiemstra、W. Nico Speckamp
DOI:10.1016/s0040-4020(01)90540-x
日期:1990.1
Aspidosperma ring system is described, based on a combination of two stereocontrolled processes. The first features a base-catalyzed cyclization of the imine 5 to generate the indoline 4. The second involves the formation of tetracycle 2 by the ring closure of N-acyliminium ion 3, whereby an allylsilane moiety functions as π-nucleophile.