Visible light induced cyclopropanation of dibromomalonates with alkenes via double-SET by photoredox catalysis
We report herein a visible light induced generation of a carbanion via double-SET and its application in cyclopropanation of alkenes. This new synthetic approach to form cyclopropane derivatives was conducted under mild conditions, using sunlight in open
Catalyst-free photocyclopropanation of dibromomalonates with alkenes: An approach to multisubstituted cyclopropanes
We report herein a novel photocyclopropanation of dibromomalonates with alkenes in the presence of Hünig base. This protocol provides an environmentally benign approach for the synthesis of multisubstituted cyclopropanes, since no catalyst is required. Th
Electrocatalytic transformation of dialkyl malonates and arylidene- or alkylidenemalononitriles into dialkyl esters of 3-substituted 2,2-dicyanocyclopropane-1,1-dicarboxylic acids
Electrolysis of alcoholic solutions of dialkyl malonates and arylidene- or alkylidenemalononitriles in the presence of NaBr in an undivided cell gave dialkyl esters of 3-substituted 2,2-dicyanocyclopropane-1,1-dicarboxylic acids in 60-90% yields.
Obtention de cyclopropanes gem-dicarboxylate par cyclocondensation de carbanions bromo- et chloromalonate sur des accepteurs de Michael
Cyclopropane gem-dicarboxylates are prepared through cyclocondensation of chloro or bromomalonate carbanion and electrophilic alkenes.The carbanion can be formed in THF by deprotonation of the monohalomalonates with powdered potassium carbonate; the chlor
Menn, Jean-Christophe Le,Tallec, Andre,Sarrazin, Jean
p. 761 - 767
(2007/10/02)
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