Efficient Synthesis of 3-Alkoxy-4,4-difluoropiperidines
作者:Norbert De Kimpe、Riccardo Surmont、Guido Verniest、Arvid De Weweire、Jan Thuring、Gregor Macdonald、Frederik Deroose
DOI:10.1055/s-0029-1217533
日期:2009.7
Fluorinated piperidines bearing an additional functional group at the heterocyclic ring are important building blocks for use in agrochemical or pharmaceutical chemistry. Therefore, for the first time 3-alkoxy-4,4-difluoropiperidines were synthesized by deoxofluorination of 3-alkoxy-4-piperidinones with morpholinosulfur trifluoride and were selectively N- and O-deprotected. In addition, the oxidation of 4,4-difluoro-3-hydroxy-1-trifluoroacetylpiperidine resulted in the interesting 4,4-difluoro-3,3-dihydroxypiperidine.