Intramolecular Reissert-Henze Reaction of Isoxazolo[2,3-a]pyridinium Salt; Facile Synthesis of Functionalized Phenacylpyridines from Ethynylpyridines
作者:Nagatoshi Nishiwaki、Masahiro Ariga、Mitsuo Komatsu、Yoshiki Ohshiro
DOI:10.3987/com-96-7448
日期:——
Oxidation of 2-(phenylethynyl)pyridine with H2O2-AcOH gave isoxazolo[2,3-a]pyridinium acetate, which was successively attacked by alcohols in the presence of Na2CO3 to afford 6-alkoxy-substituted 2-phenacylpyridines in moderate yields. It was also possible to introduce amino or alkylthio functionality onto the pyridine ring by similar process. The present reaction is a new example of intramolecular Reissert-Henze-type reaction.