Preparation of Mannich Bases from 6-Methoxy-2<i>H</i>-pyran-3(6<i>H</i>)-one and Its Epoxide
作者:Sigeru Torii、Hideo Tanaka、Hisasi Takao
DOI:10.1246/bcsj.50.2823
日期:1977.10
4-Morpholinomethyl-2H-pyran-3(6H)-ones 3 and 8 were prepared directly from 6-methoxy-2H-pyran-3(6H)-one (1) and its epoxide 4 by treatment with morpholine and aqueous 37% formalin in methanol in 70–88% yield. The mechanisms of the reaction have been discussed on the basis of the intermediates 5,6-dimethoxytetrahydropyran-3-one (2), 2,6-dimethoxy-5-hydroxytetrahydropyran-3-one (5), 2,6-dimethoxy-2H-pyran-3(6H)-one
4-Morpholinomethyl-2H-pyran-3(6H)-ones 3 和 8 直接由 6-甲氧基-2H-吡喃-3(6H)-one (1) 及其环氧化物 4 用吗啉和 37% 水溶液处理制备福尔马林的甲醇溶液,产率为 70-88%。反应机理已在中间体 5,6-二甲氧基四氢吡喃-3-酮 (2)、2,6-二甲氧基-5-羟基四氢吡喃-3-酮 (5)、2,6-二甲氧基-酮的基础上进行了讨论。 2H-吡喃-3(6H)-one (6) 和 2,5,6-三甲氧基四氢吡喃-3-one (7)。