Preparation of Pyrimidine-N-oxides by Condensation of Functionalized Enamides with Hydroxylamine Hydrochloride
作者:Hans-Ulrich Reissig、Reinhold Zimmer、Tilman Lechel、Giaime Rancan、Mrinal Bera
DOI:10.1055/s-0030-1258088
日期:2010.7
β-Alkoxy-β-ketoenamides and hydroxylamine hydrochloride smoothly provide pyrimidine-N-oxides under very mild conditions. Alkyl, aryl, and heteroaryl substituents are compatible with this new method. By treatment with acetic acid anhydride these pyrimidine-N-oxides undergo a rearrangement furnishing highly functionalized 6-acetoxymethyl-substituted pyrimidine derivatives in good yields. Our method,
β-烷氧基-β-酮烯酰胺和羟胺盐酸盐在非常温和的条件下顺利提供嘧啶-N-氧化物。烷基、芳基和杂芳基取代基与这种新方法兼容。通过用乙酸酐处理这些嘧啶-N-氧化物进行重排,以良好的产率提供高度官能化的6-乙酰氧基甲基取代的嘧啶衍生物。我们的方法基于烷氧基丙二烯、腈和羧酸的三组分反应,因此构成了一种高度灵活的制备密集取代的嘧啶衍生物的途径。