在此,我们报告了一种温和的、不含过渡金属的、高度非对映选择性的路易斯酸催化方法,用于通过乙烯基重氮酯和硝酮之间的反应合成基于异恶唑烷的重氮化合物。有趣的是,异恶唑烷产物被认为具有与先前报道的金属催化反应相反的非对映选择性。此外,相同的催化剂可以与烯醇重氮酯一起使用,促进Mukaiyama-Mannich产物的形成。然后这些重氮产物可以进一步官能化以提供苯并[ b ]氮杂卓和吡咯烷酮衍生物。
1,2-Oxazolidines. Part V. Spiro and condensed biheterocyclic isomers from nitrones and 1,3-oxazolidin-2-ones
作者:Maria C. Aversa、Giampietro Cum、Placido D. Giannetto、Giovanni Romeo、Nicola Uccella
DOI:10.1039/p19740000209
日期:——
The cycloaddition reaction between nitrones and substituted 1,3-oxazolidin-2-ones yields condensation products and spiro-compounds, each type of product containing a 1,2-oxazolidine nucleus. Their stereochemistry was elucidated by lanthanide shift analysis. The main spectrometric characteristics and the chemical behaviour of these new systems are discussed. Evidence is reported that the formation of
Highly atom efficient synthesis of 2,2,4,5-tetrasubstituted 3(2<i>H</i>)-furanones having both hydroxyl and amino substituents
作者:Jesna Antony、Sumi P. Musthafa、Rakesh Natarajan、Sindhu Mathai、Karakkattu S. Devaky、John P. Rappai
DOI:10.1080/00397911.2022.2036347
日期:2022.2.16
Abstract We have developed a highly atom efficient synthesis of tetrasubstituted 3(2H)-furanones from easily accessible starting materials such as C,N-diarylaldonitrones and dibenzoylacetylene. Control experiments revealed that reaction of aldonitrones having electron-withdrawing groups on the C-aryl substituent in polar aprotic solvents exhibited high product selectivity while reaction temperature
摘要 我们已经开发出一种高效的四取代 3(2 H )-呋喃酮合成方法,该合成方法由容易获得的起始材料(如C,N-二芳基醛固酮和二苯甲酰基乙炔)构成。对照实验表明,在C-芳基取代基上具有吸电子基团的醛固酮在极性非质子溶剂中的反应表现出高产物选择性,而反应温度对产物收率和选择性的影响可忽略不计。
Grammaticakis, Bulletin de la Societe Chimique de France, 1951, p. 965,966