作者:Kosho Makino、Yumi Hasegawa、Takahide Inoue、Koji Araki、Hidetsugu Tabata、Tetsuta Oshitari、Kiyomi Ito、Hideaki Natsugari、Hideyo Takahashi
DOI:10.1055/s-0037-1612427
日期:2019.5
A chemoselective demethylation method for various methoxypyridine derivatives has been developed. Treatment of 4-methoxypyridine with L -selectride in THF for 2 h at reflux temperature afforded 4-hydroxypyridine in good yield; no reaction to anisole occurred. The utility of our method was demonstrated by the efficient synthesis of the metabolic substances of the antiulcer agent omeprazole. Chemoselective
已经开发了各种甲氧基吡啶衍生物的化学选择性去甲基化方法。在THF中用L-selectride在回流温度下处理4-甲氧基吡啶2小时,以良好的收率得到4-羟基吡啶;对苯甲醚没有反应。我们方法的效用通过抗溃疡剂奥美拉唑代谢物质的有效合成得到证明。在 4-甲氧基苯并咪唑的存在下实现了 3,5-二甲基-4-甲氧基吡啶位点的化学选择性去甲基化。