[3 + 2] Cycloaddition Reaction of in Situ Formed Azaoxyallyl Cations with Aldehydes: An Approach to Oxazolidin-4-ones
作者:Kaifan Zhang、Chi Yang、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.6b02254
日期:2016.9.16
A novel [3 + 2] cycloaddition reaction between in situ formed azaoxyallyl cations and aldehydes has been developed. This concise method allows the rapid formation of a number of oxazolidin-4-ones in high yields with good functional group tolerance at room temperature. Further transformation and late-stage modifications of drug molecules could also be achieved in good yields, highlighting the potential
A new [3 + 4] cycloaddition of azaoxyallyl cations and anthranils has been achieved for rapid access to multisubstituted benzodiazepine derivatives. A variety of anthranils and α-halo hydroxamates were both effective substrates with simple operations under transition-metal-free conditions. The intriguing features of this method include its mild nature of the reaction conditions, high efficiency, broad
Silver(I)- and Base-Mediated [3 + 3]-Cycloaddition of <i>C</i>,<i>N</i>-Cyclic Azomethine Imines with Aza-oxyallyl Cations
作者:Xiao Cheng、Xia Cao、Jun Xuan、Wen-Jing Xiao
DOI:10.1021/acs.orglett.7b03344
日期:2018.1.5
A silver(I) and base-mediated [3 + 3]-cycloaddition reaction of in situ generated C,N-cyclic azomethine imines with in situ formed aza-oxyallyl cations is reported. This one-pot cycloaddition process shows broad substrate scope an excellent functional group tolerance and provides the corresponding biologically important isoquinoline-fused triazines in good to excellent yields.
Synthesis, Characterization of Spirocyclic λ
<sup>3</sup>
‐Iodanes and Their Application to Prepare 4,1‐Benzoxazepine‐2,5‐diones and 1,3‐Diynes
作者:Xu Sun、Xiao‐Qiang Guo、Lian‐Mei Chen、Tai‐Ran Kang
DOI:10.1002/chem.202005124
日期:2021.3
cycloaddition of aza‐oxyallylic cations with ethynylbenziodoxolones for synthesis of new λ3‐iodanes containing spirocyclic 4‐oxazolidinone has been developed. This cyclic λ3‐iodanes display stability in air and excellent solubility in organic solvent. Using them as substrate, both the 4,1‐benzoxazepine‐2,5‐diones and symmetrical 1,3‐diynes derivatives were afforded in high yield under copper(I)‐catalyzed
Leveraging the Domino Skeletal Expansion of Thia-/Selenazolidinones via Nitrogen-Atom Transfer in Hexafluoroisopropanol: Room Temperature Access to Six-Membered S/Se,N-Heterocycles
作者:Vandana Jaiswal、Mangilal Godara、Dinabandhu Das、Vincent Gandon、Jaideep Saha
DOI:10.1021/acs.joc.1c02621
日期:2022.1.7
Herein, a highly regioselective domino skeletal-expansion process that transforms 2-aminothiazolidinone into six-membered S,N-heterocycle is developed with the aid of TMS-azide in hexafluoroisopropanol (HFIP) at ambient temperature. Functioning of the C2 tertiaryamine as latent reactive group on thiazolidinone moiety was the key to this development, which allowed relay substitution with azide and