Synthesis of 2-Fluoro-1,4-benzoxazines and 2-Fluoro-1,4-benzoxazepin-5-ones by Exploring the Nucleophilic Vinylic Substitution (S<sub>N</sub>V) Reaction of <i>gem</i>-Difluoroenamides
作者:Tamara Meiresonne、Guido Verniest、Norbert De Kimpe、Sven Mangelinckx
DOI:10.1021/acs.joc.5b00507
日期:2015.5.15
novel structural units which have been explored as precursors in heterocyclic synthesis. The presence of two fluorine atoms at the β-position of the enamide moiety endows unique electrophilic reactivity. Treatment of these enamides with oxygen nucleophiles gives rise to a nucleophilic vinylic substitution (SNV) reaction, which was directed toward 2-fluoro-1,4-benzoxazines and 2-fluoro-1,4-benzoxazepin-5-ones
N-苯甲酰基β,β-二氟代酰胺和N-苯甲酰基氟代酰胺是新颖的结构单元,已被探索为杂环合成中的前体。在烯酰胺部分的β-位置上存在两个氟原子赋予独特的亲电反应性。这些烯酰胺与氧亲核试剂的治疗引起的亲核取代乙烯基(S Ñ其朝向2-氟-1,4-苯并恶嗪和2-氟-1,4-苯并氧氮杂-5-酮V)反应,。此外,首次以极高的收率制备了一种新型的结构化基团氟代酰胺。在这种情况下,还观察到亲核试剂跨三键的β-加成。