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
3,3-二取代ñ - (2-羟乙基)-2- [1-(苯基磺酰基)-3-吲哚基] -哌啶4示出了以K的前方的特定反应性吨迪布奥/ BF 3 .ET 2 ○:中间spiroindolenine 15演变为色氨酸哌啶鎓盐,其经历Wagner-Meerwein重排,然后质子消除,得到2,3-二取代的N-色氨酸哌啶-3-丙烯酸酯19