Hexafluoroacetone as a protecting and activating reagent: 5,5-difluoro- and trans -5-fluoropipecolic acids from glutamic acid
作者:Alexander S. Golubev、Hartmut Schedel、Gabor Radics、Marco Fioroni、Sven Thust、Klaus Burger
DOI:10.1016/j.tetlet.2003.12.038
日期:2004.2
Starting from hexafluoroacetone-protected (S)-glutamic acid, trans-5-fluoropipecolic and 5,5-difluoropipecolic acid have been synthesized. The piperidine ring was constructed by an intramolecular metal carbenoid NH insertion. (C) 2003 Elsevier Ltd. All rights reserved.