We report herein a visiblelightinduced 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 air, showing the features such as environmental benignness and an easy to handle procedure.
We report herein a novel photocyclopropanation of dibromomalonates with alkenes in the presence of Hunig base. This protocol provides an environmentally benign approach for the synthesis of multisubstituted cyclopropanes, since no catalyst is required. The Photo-induced Electron Transfer (PET) from Hunig base to dibromomalonate is the key process during this transformation. (C) 2015 Elsevier Ltd. All rights reserved.