Three-Component Heterocyclization of <i>gem</i>-Bromofluorocyclopropanes with NOBF<sub>4</sub>: Access to 4-Fluoropyrimidine <i>N</i>-Oxides
作者:Kseniya N. Sedenkova、Elena B. Averina、Yuri K. Grishin、Andrei G. Kutateladze、Victor B. Rybakov、Tamara S. Kuznetsova、Nikolay S. Zefirov
DOI:10.1021/jo301880m
日期:2012.11.2
Novel three-component heterocyclization involving gem-bromofluorocyclopropanes, nitrosyl tetrafluoroborate, and a molecule of the solvent (nitrile) yielding previously unknown fluorinated pyrimidine N-oxides is described. A two-step synthetic approach to 4-fluoropyrimidine N-oxides from alkenes under mild conditions is developed using this reaction. Mechanistic aspects of the heterocyclization are discussed.
A novel and effective approach to 4-fluoropyrimidines
作者:Kseniya N. Sedenkova、Elena B. Averina、Yuri K. Grishin、Tamara S. Kuznetsova、Nikolay S. Zefirov
DOI:10.1016/j.tetlet.2013.11.070
日期:2014.1
4-fluoropyrimidine 1-oxides, obtained via three-component heterocyclization, was studied under various reduction conditions. An effective preparative method for the synthesis of 4-fluoropyrimidines from readily available starting materials was elaborated. 4-Fluoro-substituted tetrahydroquinazolines and tetrahydroquinazoline N-oxides were demonstrated to be highly reactive in aromatic nucleophilic substitution.