New insight into anionic cyclizations of alkynyl- and ortho-dialkynylarenes: a specific reactivity of 3-alkynyl-2-chloro- and 2,3-dialkynylquinoxalines and related compounds toward CH-acids’ carbanions
作者:Anna V. Gulevskaya、Huong T.L. Nguyen、Alexander S. Tyaglivy、Alexander F. Pozharskii
DOI:10.1016/j.tet.2011.11.018
日期:2012.1
on the nature of the used C-nucleophile, the thus formed anionic adduct underwent further cyclization via (i) intramolecularnucleophilic substitution of the chlorine atom, (ii) intramolecular acylation of the ring nitrogen atom by the ester side chain or (iii) intramolecularnucleophilic attack on the second CC bond. Reactions of 3-alkynyl-2-chloro- and 2,3-dialkynylpyrazines with 1,3-dimethylbarbituric