<i>N,N,N′,N′</i>-Tetramethylchloroformamidinium Chloride-Mediated Cyclizations of β-Oxo Amides: Facile and Divergent One-Pot Synthesis of Substituted 2<i>H</i>-Pyrans, 4<i>H</i>-Pyrans and Pyridin-2(1<i>H</i>)-ones
作者:Yan Wang、Xin Xin、Yongjiu Liang、Yingjie Lin、Haifeng Duan、Dewen Dong
DOI:10.1002/adsc.200900310
日期:2009.9
An efficient and divergent one-pot synthesis of substituted 2H-pyrans, 4H-pyrans and pyridin-2(1H)-ones from β-oxo amides based on the selection of the reaction conditions is reported. Mediated by N,N,N′,N′-tetramethylchloroformamidinium chloride, β-oxo amides underwent intermolecular cyclizations in the presence of triethylamine at room temperature to give substituted 2H-pyrans in high yields, which
基于反应条件的选择,报道了由β-氧代酰胺有效且发散的一锅合成取代的2 H-吡喃,4 H-吡喃和吡啶-2(1 H)-一。通过介导的N,N,N',N' -tetramethylchloroformamidinium氯化物,β氧代酰胺在室温下进行,在三乙胺的存在下环化的分子间,得到取代的2- ħ以高产率,这可能会被转化成取代的4- -pyrans ħ -在室温下在乙醇中存在氢氧化钠的情况下将吡喃转化为吡喃,或在回流下转化为取代的吡啶2-2(1 H)-吡喃。