Nitrosation of methyl 2-cinnamoylamino-3-dimethylaminopropenoates. Alkyl<i>N</i>-cinnamoyloxalic acid hydroxyimidic amides, intermediates in the synthesis of alkyl 5-styryl-1,2,4-oxadiazole-3-carboxylates
作者:Matej Kmetič、Branko Stanovnik
DOI:10.1002/jhet.5570340610
日期:1997.11
Alkyl 2-(substituted cinnamoylamino)-3-dimethylaminopropenoates 5, prepared either from glycine (1) and substituted cinnamoyl chlorides 2 via oxazol-5(4H)-ones 4, or from cinnamoylglycinate with t-butoxy-bisdimethylaminomethane, were transformed by nitrosation into 5-substituted-1,2,4-oxadiazole-3-carboxylates 8. The formation of alkyl N-cinnamoyloxalic acid hydroxyimidic amides 7, which were isolated
由甘氨酸(1)和取代的肉桂酰氯2 经由oxazol-5(4 H)-ones 4或由肉桂酰甘氨酸酯与叔丁氧基-双二甲基氨基甲烷转化制得的2-(取代的肉桂酰基氨基)-3-二甲基氨基丙烯酸烷基酯5亚硝化成5-取代-1,2,4-恶二唑-3-羧酸酯8。分离出作为中间体的烷基N-肉桂酰基草酸羟基酰亚胺酰胺7的形成代表了N-酰基取代的羟基酰亚胺酰胺的新合成。