Electrocatalytic transformation of malononitrile and cycloalkylidenemalononitriles into spirotricyclic and spirotetracyclic compounds containing cyclopropane and pyrroline fragments
摘要:
Electrolysis of cycloalkylidenemalononitriles and malononitrile in MeOH in all undivided cell in the presence of the NaBr-NaOMe mediator system gives spirotricyclic compounds containing cyclopropane and pyrroline fragments in 50-77% yields. Spirobicyclic and spirotricyclic tetracyanocyclopropanes undergo electrolysis ill alcohols to afford spirotricyclic and spirotetracyclic products containing cyclopropane and pyrroline fragments ill 50-93% yields.
Electrocatalytic transformation of malononitrile and cycloalkylidenemalononitriles into spirobicyclic and spirotricyclic compounds containing 1,1,2,2-tetracyanocyclopropane fragment
摘要:
Electrolysis of malononitrile and cycloalkylidenemalononitriles in EtOH in an undivided cell in the presence of NaBr affords spirobicyclic Compounds containing a 1,1,2,2-tetra-cyanocyclopropane fragment in 50-88% yields.
A new type of cascade reaction: direct conversion of carbonyl compounds and malononitrile into substituted tetracyanocyclopropanes
作者:Michail N. Elinson、Anatolii N. Vereshchagin、Nikita O. Stepanov、Alexey I. Ilovaisky、Alexander Ya. Vorontsov、Gennady I. Nikishin
DOI:10.1016/j.tet.2009.05.062
日期:2009.8
A new type of chemical cascadereaction was found: the direct formation of cyclopropanes from carbonyl compounds and C–H acid. The action of free halogen or active halogen containing compounds on a mixture of 1 equiv of carbonyl compound and 2 equiv of malononitrile in a basic alcohol solution results in the formation of substituted 1,1,2,2-tetracyanocyclopropanes in 15–80% yield. The latter are well-known