Nitrosation of methyl 2-acylamino-3-dimethylaminopropenoates. A simple conversion of<i>n</i>-acylglycines into 5-substituted 1,2,4-Oxadiazole-3-carboxylates
作者:Matej Kmetiĉ、Branko Stanovnik
DOI:10.1002/jhet.5570320525
日期:1995.9
omethyleneoxazol-5(4H)-ones 2, followed by opening into 2-aroylamino-3-dimethylamino-propenoates 3, and nitrosation to give the oximes 4 as intermediates, which cyclize spontaneously into 5-substituted-1,2,4-oxadiazole-3-carboxylates 5. The compounds 2 can be transformed into 5 without isolation of 3 and 4.
由N-酰基甘氨酸1合成5取代的1,1,2,4-恶二唑-3-羧酸酯5的新方法,在氯氧化磷存在下,用DMF将其转化为2取代的-4-二甲基-氨基亚甲基恶唑-5 (4 H)-ones 2,接着打开2-芳酰基氨基-3-二甲基氨基-丙酸酯3,进行亚硝化,得到肟4作为中间体,肟自发环化成5-取代的1,2,4,4-恶二唑-3 -羧酸盐5。化合物2可以转化为5,而无需分离3和4。