Synthetic studies on indole alkaloids. VII. Effect of the piperidine ring substitution on intramolecular KtBuO/BF3.Et2O cyclization of N-(2-hydroxyethyl)-2-[1-(phenylsulfonyl)-3-indolyl]piperidines
作者:A. Diez、C. Villa、M. Rubiralta
DOI:10.1016/s0040-4020(01)89918-x
日期:1993.5
3,3-Disubstituted N-(2-hydroxyethyl)-2-[1-(phenylsulfonyl)-3-indolyl]-piperidine 4 shows a particular reactivity in front of KtBuO/BF3.Et2O: the intermediate spiroindolenine 15 evolves to a tryptophylpiperidinium salt, which undergoes a Wagner-Meerwein rearrangement followed by a proton elimination to yield the 2,3-disubstituted N-tryptophylpiperidine-3-acrylates 19