A rare carbon–carbon-bond forming reaction on a furoxanring has been developed. The nucleophilic aromatic substitution (SNAr) reaction of 4-nitrofuroxans with alkynyl lithium proceeded with high yields, which enabled the first practical synthesis of both alkynyl furoxan regioisomers. Due to the versatility of the alkyne functional group, various derivatizations of the carbon–carbon triple bond in
Furoxans are distinctive heteroaromatic compounds in that they are potentially capable of releasing nitric oxide under physiological conditions. In order to utilize the furoxan scaffold for the development of functional molecules, synthetically relevant functional groups are required for access to diverse furoxans. In this report, a facile route to furoxans with sulfonyloxy groups, which are halide
Dinitrogen Trioxide-Mediated Domino Process for the Regioselective Construction of 4-Nitrofuroxans from Acrylic Acids
作者:Leonid L. Fershtat、Marina I. Struchkova、Alexander S. Goloveshkin、Ivan S. Bushmarinov、Nina N. Makhova
DOI:10.1002/hc.21166
日期:2014.7
4-Nitrofuroxans (4-nitro-1,2,5-oxadiazole 2-oxides) were prepared by a dinitrogentrioxide–mediateddomino reaction of acrylicacids under the action of NaNO2 excess in AcOH at room temperature. The reaction proceeds completely regioselectively and presents a new, simple, general, and safe method for the preparation of both 3-aryl- and 3-alkyl-4-nitrofuroxans available with difficulty before. A mechanism