Aminoacids in the synthesis of heterocyclic systems. The synthesis of methyl 2-acetylamino-3-dimethylaminopropenoate and 2-(<i>N</i>-methyl-<i>N</i>-trifluoroacetyl)amino-3-dimethylaminopropenoate and their application in the synthesis of heterocyclic compounds
作者:Lucija Kralj、Aleš Hvala、Jurij Svete、Ljubo Golič、Branko Stanovnik
DOI:10.1002/jhet.5570340137
日期:1997.1
prepared from N-acetylglycine (1), which was converted with N,N-dimethylformamide and phosphorus oxychloride into 4-dimethylaminomethylene-2-methyl-5(4H)-oxazolone (2), followed by treatment with methanol in the presence of potassium carbonate, into 3. The compound 3 was shown to be a versatile reagent in the synthesis of various heterocyclic systems. With N-nucleophiles, such as heterocyclic amines
由N-乙酰基甘氨酸(1)制备(Z)-2-乙酰氨基-3-二甲基氨基丙酸甲酯(3 ),将其与N,N-二甲基甲酰胺和氯氧化磷转化为4-二甲基氨基亚甲基-2-甲基-5(4 H)-恶唑酮(2),然后在碳酸钾存在下用甲醇处理成3。化合物3在多种杂环系统的合成中被证明是一种多功能试剂。与Ñ -nucleophiles,如杂环胺4,或者甲基2-乙酰氨基-3- heteroarylaminopropenoates 5或形成稠合的6 pyrimidinoncs,取决于反应条件和/或杂环取代基:C ^-具有活性或潜在活性亚甲基的亲核试剂,例如1,3-二羰基化合物7、8和9,取代的苯酚10a,b,萘酚11、12a-c和取代的香豆素13a,提供了取代的吡喃酮20和22,和熔融的吡喃酮21、23–26。含氮杂环14-19产生吡喃嗪27-31和吡喃唑32。在所有这些系统中,乙酰氨基基团连接在新形成的吡喃酮环的3位上。通