Visible light induced singlet nucleophilic carbene intermediates undergo {rapid|fast|speedy} [2+1]-cycloaddition with tethered olefins to afford {unique|distinctive|special|exclusive|exceptional|one of a kind} bicyclo[3.1.0]hexane and bicyclo[4.1.0]heptane scaffolds. This cyclopropanation proceeds {using|utilizing|making use of|employing|working with|applying} only visible light irradiation, circumventing {the use of|the usage of} exogenous (photo)catalysts or sensitisers and showcases an underexplored mode of reactivity for nucleophilic carbenes in chemical synthesis. The discovery of {additional|extra|further|added|more} transformations {including|such as|which includes|like} a cyclopropanation/retro-Michael/Michael cascade reaction to afford chromanone derivatives are also described. 1025796-31-9 supplier Formula of Fmoc-D-Tyr(3-I)-OH PMID:24513027
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