Reactions of α,<i>N</i>-Diarylnitrones with<i>O</i>-Methyl Diphenylphosphinothioate and Oxidations of<i>N</i>-Alkylidene-2-hydroxyanilines with Silver Oxide. Preparation of Benzoxazoles
作者:Masaaki Yoshifuji、Rihei Nagase、Naoki Inamoto
DOI:10.1246/bcsj.55.873
日期:1982.3
Reactions of α,N-diarylnitrones in the presence of O-methyl diphenylphosphinothioate at 150 °C gave 2-arylbenzoxazoles (3) in fairly good yields. Oxidation of N-alkylidene-2-hydroxyanilines with silver oxide afforded 2-alkenyl-, 2-alkyl-, or 2-arylbenzoxazoles (7 and 3) in good yields under mild reaction conditions (at room temperature). A plausible mechanism for formation of 3 and 7 has been discussed
α,N-二芳基硝酮在 O-甲基二苯基硫代膦酸酯存在下于 150 °C 反应,以相当好的收率得到 2-芳基苯并恶唑 (3)。用氧化银氧化 N-亚烷基-2-羟基苯胺,在温和的反应条件下(室温)以良好的产率得到 2-烯基-、2-烷基-或 2-芳基苯并恶唑(7 和 3)。已经简要讨论了形成 3 和 7 的合理机制。