Transformations of enaminones. A simple one-pot synthesis of imidazolone derivatives
作者:Jure Bezenšek、Uroš Grošelj、Katarina Stare、Jurij Svete、Branko Stanovnik
DOI:10.1016/j.tet.2011.11.013
日期:2012.1
Ethyl (5-benzoyl-2-oxo-3-substituted-2,3-dihydro-1H-imidazol-1-yl)carbamates 7 were prepared by the Michael addition of diethyl azodicarboxylate (3) to (E)-3-(dimethylamino)-1-phenylprop-2-en-1-one (2) followed by substitution of the dimethylamino group with primary amines 5a–n to afford a mixture of (E) and (Z) diethyl 1-(1-(substituted)amino)-3-oxo-3-phenylprop-1-en-2-yl)hydrazine-1,2-dicarboxylates
(5-苯甲酰基-2-氧代-3-取代的2,3-二氢-1 H-咪唑-1-基)氨基甲酸乙酯7是通过将偶氮二羧酸二乙酯(3)迈克尔加成到(E)-3-上而制得的(二甲基氨基)-1-苯基丙-2-烯-1-酮(2),然后用伯胺5a – n取代二甲基氨基,得到(E)和(Z)二乙基1-(1-(取代的)氨基)-3-氧代-3-苯基丙-1-烯-2-基)肼-1,2-二羧酸酯(6a – n),然后环化得到最终产物7a – n。中级分离并鉴定了6i并将其转化为7i。所有咪唑啉酮7a - n均按一锅反应顺序合成,单个反应非常干净。