Tamara Meiresonne, G. Verniest, N. De Kimpe*
May 6, 2015
Citations
0
Influential Citations
10
Citations
Journal
The Journal of organic chemistry
Abstract
N-Benzoyl β,β-difluoroenamides and N-benzoyl fluoroynamides are 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 (S(N)V) reaction, which was directed toward 2-fluoro-1,4-benzoxazines and 2-fluoro-1,4-benzoxazepin-5-ones. Furthermore, fluorinated ynamides, a new type of building block, were prepared in excellent yields for the first time. In this case, β-addition of nucleophiles across the triple bond is observed also.