23511-08-2Relevant articles and documents
Enantioselective cyclopropanation of enals by oxidative N-heterocyclic carbene catalysis
Biswas, Anup,De Sarkar, Suman,Tebben, Ludger,Studer, Armido
supporting information; experimental part, p. 5190 - 5192 (2012/06/01)
Carbene catalysed redox activation of α,β-unsaturated aldehydes is applied for generation of α,β-unsaturated acyl azoliums which undergo cyclopropanation upon reaction with a sulfur ylide and an alcohol to give the corresponding cyclopropanecarboxylic acid esters. With chiral carbenes good to excellent diastereo and enantioselectivities are obtained.
A new photochemical route to cyclopropanes
Wessig, Pablo,Muehling, Olaf
, p. 1064 - 1065 (2007/10/03)
Especially highly substituted cyclopropanes can be produced with a new photochemical approach. Starting with aromatic ketones that bear a leaving group adjacent to the carbonyl carbon atom, photolysis leads to the formation of 1,3-diradicals, which efficiently cyclize to cyclopropanes (see scheme; Ms=MeSO2).