A novel and efficient iron-catalyzed cycloaddition reaction using readily available 2,3-diaryl-2H-azirines and primary amides is reported. A wide range of trisubstituted oxazoles could be achieved in good yields with good functional group compatibility. In this transformation, two C–N bonds were cleaed and new C–N and C–O bonds were formed.
A copper-catalyzed [2 + 3] formal cyclization reaction between α-hydroxyl ketones and arylacetonitriles has been developed. The reaction outcome was ultimately dependent on the structure of the α-hydroxy ketones employed. Tertiary α-hydroxy ketones gave 3,4,5,5-tetrasubstituted butenolides as the sole products, while secondary α-hydroxy ketones furnished 2,4,5-trisubstituted oxazoles selectively. This
Synthesis of 2,4,5-trisubstituted oxazoles from 1,2-diketones and amines by using an electrochemical method
作者:Liangxiao Wei、Gaoqing Yuan
DOI:10.1016/j.tet.2023.133246
日期:2023.2
An efficient electrochemical synthesis of trisubstituted oxazoles from readily available 1,2-diketones and amines is described. With KI as the electrocatalyst, t-BuOK as the base and MeOH as the electrolytic solvent, the electrochemical synthesis could be smoothly performed in an undivided cell to afford 2,4,5-trisubstituted oxazoles in good yields at room temperature.
描述了从容易获得的 1,2-二酮和胺中高效电化学合成三取代恶唑。以 KI 为电催化剂,t -BuOK 为碱,MeOH 为电解溶剂,电化学合成可以在未分隔的电池中顺利进行,在室温下以良好的产率得到 2,4,5-三取代恶唑。
Visible light‐mediated photocatalyzed synthesis of oxazole via intermolecular <scp>CN</scp> and <scp>CO</scp> bond formation
作者:Mohd Zaheeruddin Beg、Shraddha Tivari、Akanksha Kashyap、Pravin K. Singh、Praveen P. Singh、Pankaj Nainwal、Vishal Srivastava
DOI:10.1002/jhet.4766
日期:2024.3
An efficient visible light-mediated, eosin Y-catalyzed synthesis of oxazole has been developed from benzil with primary amines, that providing a straightforward, green, and environmentally benign access to a wide variety of substituted oxazole-2-amines under mild reaction conditions.
苯偶酰和伯胺开发了一种有效的可见光介导、曙红 Y 催化合成恶唑的方法,为在温和的反应条件下合成各种取代恶唑-2-胺提供了直接、绿色和环境友好的方法。
Lora-Tamayo,M. et al., Chemische Berichte, 1964, vol. 97, p. 2230 - 2233