A Simple Preparation of Amides from Acids and Amines by Heating of Their Mixture
作者:Branko S. Jursic、Zoran Zdravkovski
DOI:10.1080/00397919308013807
日期:1993.11
Abstract Heating a mixture of an amine and an acid is demonstrated as the method of choice for the preparation of many amides. The yields depend on the physical properties and thermal stability of the reactants and range from good to excellent. The ideal reactants should have melting points below 200 °C, should not be highly volatile and should be thermally stable at that temperature for 30 minutes
摘要 加热胺和酸的混合物被证明是制备许多酰胺的首选方法。产率取决于反应物的物理性质和热稳定性,范围从良好到极好。理想的反应物应具有低于 200 °C 的熔点,不应具有高度挥发性,并且应在该温度下热稳定 30 分钟。通过在反应中使用酸酯代替酸可以克服这些缺点中的一些。该方法以其简单、低成本和反应时间短而脱颖而出。它也可以非常大规模地进行,不需要溶剂和反应物的特殊纯化。
Novel synthesis of pyridazino[4,5-b][1,4]oxazin-3,8-diones☆
A novel and effective synthesis of pyridazino[4,5-b][1,4]oxazin-3,8-diones via Smiles rearrangement is presented. Treatment of N-substituted 2-chloro(or hydroxy)acetamide, 2-tetrahydropyranyl-4-chloro-5-hydroxy(or chloro)pyridazin-3-one and cesium carbonate in refluxing acetonitrile was afforded the corresponding pyridazino[4,5-b][1,4]oxazin-3,8-diones in excellent yield.
提出了一种通过Smiles重排合成新颖有效的哒嗪并[4,5- b ] [1,4]恶嗪-3,8-二酮的方法。在回流的乙腈中处理N-取代的2-氯(或羟基)乙酰胺,2-四氢吡喃基-4-氯-5-羟基(或氯)哒嗪-3-酮和碳酸铯,得到相应的哒嗪[4,5-]。b ] [1,4]恶嗪-3,8-二酮,收率高。
SYNTHESIS AND CHARACTERIZATION OF N-ALKYL HYDROXYACETAMIDES
作者:Luis S. Zamudio Rivera、Lourdes Carrillo、Teresa Mancilla
DOI:10.1080/00304940009356751
日期:2000.2
has been used in the preparation of photographic elements,? and of heterocyclic compounds;3-6 it also has been found as a metabolite of 2-acetyl-3phenyltetrahydro1,2,4-0xadiazin-5-one in rats' and N-benzhydryl haloacetamides have been used as protective groups in peptide syntheses.8 Hydroxyacetamides have been prepared by a) ammonolysis of the ethyl esters of the a-hydroxy acids, b) dehydration of the
1950 年代末合成了多种羟基乙酰胺作为潜在的抗惊厥药。,N-苄基羟基乙酰胺已用于制备照相元件,?和杂环化合物;3-6 它还被发现作为 2-乙酰-3 苯基四氢 1,2,4-0xdiazin-5-one 在大鼠体内的代谢物,并且 N-二苯甲基卤代乙酰胺已被用作肽合成中的保护基团。 8 羟基乙酰胺已通过 a) α-羟基酸乙酯的氨解,b) 相应胺盐的脱水和 c) 胺与丙交酯或聚乙交酯的反应制备。