氨基甲酰基化剂氨基甲酰基叠氮化物和氨基甲酰基氰化物(又名氰基甲酰胺)以不同的方式与羟胺反应,在第一种情况下生成N-羟基脲,在氨基甲酰基氰化物的情况下,生成氨基甲酰基a肟肟衍生物。为后一种类型的化合物开发的合成方法代表了杂环结构的一种有趣的前体,可以高效地制备各种实例。在比较异丙基和苄基衍生物的实验值和计算出的13 C和15 N NMR化学位移值的基础上,提出了mid胺肟部分中双键的Z构型。
One-Pot Synthesis of Carbamoyl Azides Directly from Primary Alcohols and Oxidation of Secondary Alcohols to Ketones Using Iodobenzene Dichloride in Combination with Sodium Azide
作者:Xiao-Qiang Li、Wei-Kun Wang、Chi Zhang
DOI:10.1002/adsc.200900428
日期:2009.10
An effective synthesis of carbamoyl azides directly from primary alcohols using iodobenzenedichloride in combination with sodium azide has been developed. Moreover, the same regent combination was also efficient for the oxidation of secondary alcohols to the corresponding ketones.
Treatment of amines under a carbon dioxide atmosphere with tetramethylphenylguanidine (PhTMG) and diphenylphosphoryl azide (DPPA) in acetonitrile below 0 °C provides carbamoyl azides in high to excellent yields. In addition, epimerization is not observed when optically pure α-amino esters are used as substrates.
A novel method was developed for the synthesis of carbamoyl azides from hydroxamic acids via the Lossen rearrangement using diphenyl phosphorazidate, which acts as both the activator and azide source to produce the azidesvia an isocyanate intermediate. Using this method, various hydroxamic acids were converted into the corresponding carbamoyl azides, enabling their preparation without the use of highly
hydrogenation) avoiding the unstable intermediate diazonium, as reported during the previous preparation. Alkali and alkalineearth metal salts with lithium (1), sodium (2), potassium (3), rubidium (4) caesium (5), magnesium (6), calcium (7), strontium (8) and barium (9) were prepared and fully characterized using elemental analysis, IR and NMR spectroscopy, DSC and TG analysis. All metal salts were characterized
如先前的制备过程中所报道的那样,通过三个步骤(加成,环化和催化氢化),通过适度的策略合成了四唑酮(5-氧杂唑),避免了不稳定的中间体重氮。碱金属和碱土金属盐,含锂(1),钠(2),钾(3),rub(4)铯(5),镁(6),钙(7),锶(8)和钡(9)使用元素分析,IR和NMR光谱,DSC和TG分析制备并完全表征。所有金属盐的特征均通过单晶X射线衍射。它们在1.479(1)至3.060 g cm -3(5)的高密度公共空间群中结晶。此外,晶体结构7,8和9揭示了具有很强的氢键相互作用有趣多孔高能配位聚合物。所有新的盐都具有良好的热稳定性,分解温度在215.0°C(4)至328.2°C(7),明显高于报道的富氮盐中性四唑酮。使用标准方法测试了对冲击和摩擦的敏感性,并且所研究的所有基于四唑酮的化合物都可以分类为不敏感。这些金属盐的火焰测试支持它们潜在地用作无高氯酸盐的烟火剂或环保型不敏感的高能材料。
Synthesis of Carbamoyl Azides and 1-Substituted Tetrazol-5-ones from Isocyanates and NaN3 in the Presence of ZnCl2
作者:Е. А. Tishchenko、L. V. Myznikov
DOI:10.1134/s1070363222050085
日期:2022.5
Abstract Isocyanates readily reacts with NaN3 in the presence of ZnCl2 in organic solvents to form the corresponding carbamoylazides. The formation of carbamoylazides completed in 5–10 min at room temperature, which prevent the risk of release of hydrogen azide. The obtained carbamoylazides without isolation can be used for the preparation of 1-substituted tetrazol-5-ones.
摘要 在有机溶剂中存在 ZnCl 2的情况下,异氰酸酯很容易与 NaN 3反应形成相应的氨基甲酰叠氮化物。在室温下,氨基甲酰叠氮化物的形成在 5-10 分钟内完成,从而防止了叠氮化氢释放的风险。所得氨基甲酰叠氮化物未经分离可用于制备1-取代四唑-5-酮。