thermolysis conditions presumably occurs via the initially formed unstable dipolar bicyclic intermediates 4. Isomerization of these intermediates and subsequent addition of the second molecule of diphenylcyclopropenone with the extrusion of one molecule of carbon monoxide results in the formation of tricyclic 4a,7b-diazacyclopenta[cd]inden-7-ones 8 in good yields.
在热解条件下,由6-芳基-1,5-二氮杂双环[3.1.0]己烷1生成的偶氮甲亚胺与二甲环亚胺形成的二倍过量的二苯基环丙烯酮的正式[2 + 3]环加成反应可能是通过最初形成的不稳定的偶极双环中间体4发生的。这些中间体的异构化以及随后的第二分子二苯基环丙烯酮的加入以及一分子一氧化碳的挤出导致以良好的产率形成三环的4a,7b-二氮杂环戊[ cd ]茚满7-酮8。
Cobalt-Catalyzed Stereospecific C–N/C–O Bond Formation of Oxiranes with Diaziridines
作者:Prabhat K. Maharana、Tanumay Sarkar、Subhradeep Kar、Siddhartha K. Purkayastha、Ankur K. Guha、Tharmalingam Punniyamurthy
DOI:10.1021/acs.joc.3c00445
日期:2023.7.7
Co-catalyzed stereospecific C–N and C–O bond formation of oxiranes with diaziridines has been accomplished to furnish tetrahydro-[1,3,4]-oxadiazines at room temperature. Optically active oxiranes can be coupled with high optical purities (>96% ee). Stereoselectivity, functional group tolerance, mechanistic studies using DFT, and natural product modification are the important practical features.
obtained and characterized by X-ray diffraction analysis, spectral and physicochemical methods. The features of the enantiomers of the considered compounds are analysed by quantum chemistry methods and crystal packing modeling methods. It is shown that intermolecular interactions in solid state radically change the nature of the conformationalstructure of 1,5-diazabicyclo[3.1.0]hexanes.
Efficient annulation of in situ formed azaoxyallyl cations using a base has been accomplished with diaziridines to provide 1,2,4-triazines at room temperature. The substrate scope, scale up, functional group tolerance and transition-metal free reaction conditions are the important practical features.
The coupling of diaziridines with donor–acceptor aziridines (DAAs) has been achieved using Zn-catalysis to furnish imidazopyrazole-4,4-dicarboxylates via [1,4]-hydride shift. The use of Zn-catalysis, [1,4]-hydride shift, natural product modification and a late-stage molecular docking study are important practical features.