direct synthesis process. The optimized reaction conditions showed an excellent applicability for the synthesis of a range of 4-cyanofuroxans. 3-Cyanofuroxans, known to be thiol-mediated nitric oxide donors, could also be obtained by the thermal or photochemical isomerization of 4-cyanofuroxans. The developed cyanation of furoxans is a rare example of CC bond-forming reaction on a furoxanring.
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