A new preparative procedure for N-(diazoacetyl)glycine ethyl ester is described. The interaction of N-(diazoacetyl)glycine ethyl ester with four phenoxyacetyl chlorides gives the 4-phenoxylderivatives of N-(2-diazo-3-oxobutanoyl)glycine ethyl ester, and with β-(o-methoxyphenoxy)-propionyl chloride yields N-[2-diazo-3-oxo-5-(o-methoxyphenoxy)pentanoyl]glycine ethyl ester. A general chromatographic procedure for separating N-(2-diazo-3-oxoalkanoyl)glycine ethyl esters from N-(chloroacetyl)glycine ethyl ester has been developed. Crotonyl chloride reacts with a 1 mole excess of N-(diazoacetyl)glycine ethyl ester to form N-(2-diazo-3-oxo-4-hexenoyl)glycine ethyl ester, and with a 2 mole excess to form N-2-diazo-3-oxo-3-[4′-methyl-5′(carboethoxymethyl)carbamoyl-Δ2pyrazolin-3′-yl]propanoyl}glycine ethyl ester, presumably by isomerization of an initially formed Δ1-pyrazoline derivative. The interaction of benzoyl and m-bromobenzoyl bromide with N-(diazoacetyl)glycine ethyl ester results initially in yellow oily products which, on the basis of spectral data, are the expected N-(2-diazo-3-oxo-3-rylpropanoyl)glycine ethyl esters. During chromatographic purification and (or) attempted crystallization, there occurs an isomerization to colorless crystalline products. The analytical and molecular weight data, together with the spectral evidence, support the tentative assignment of 1,2,3-triazole structures to the isomerization products. A spontaneous reverse Dimroth rearrangement is postulated.
描述了一种制备N-(重氮乙酰)甘氨酸乙酯的新方法。N-(重氮乙酰)甘氨酸乙酯与四种苯氧乙酰氯反应得到N-(2-重氮-3-氧代丁酰)甘氨酸乙酯的4-苯氧基衍生物,与β-(o-甲氧苯氧基)-丙酰氯反应得到N-[2-重氮-3-氧代-5-(o-甲氧苯氧基)戊酰基]甘氨酸乙酯。开发了一种通用的色谱分离方法,可将N-(2-重氮-3-氧代烷酰)甘氨酸乙酯与N-(氯乙酰)甘氨酸乙酯分离。巴豆酰氯与1摩尔过量的N-(重氮乙酰)甘氨酸乙酯反应得到N-(2-重氮-3-氧代-4-己烯酰)甘氨酸乙酯,与2摩尔过量的反应得到N-2-重氮-3-氧代-3-[4′-甲基-5′(羧乙氧甲基)氨基-Δ2吡唑烷-3′-基]丙酰}甘氨酸乙酯,可能是由最初形成的Δ1-吡唑烷衍生物异构化而成。苯甲酰和m-溴苯甲酰溴与N-(重氮乙酰)甘氨酸乙酯反应,最初产生黄色油状产物,根据光谱数据,这些产物是预期的N-(2-重氮-3-氧代-3-烷基丙酰)甘氨酸乙酯。在色谱纯化和/或试图结晶过程中,发生了异构化,形成无色晶体产物。分析和分子量数据以及光谱证据支持将异构化产物的结构归属于1,2,3-三唑。假定存在自发反向Dimroth重排。