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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Five-bond cleavage in copper-catalyzed skeletal rearrangement of O-propargyl arylaldoximes to beta-lactams.

Copper-catalyzed skeletal rearrangement of O-propargyl arylaldoximes 1 produced the corresponding 4-arylidene-2-azetidinones 2 and their regioisomers 2' in good to excellent yields. For example, the reaction of benzaldehyde O-1,3-diphenylprop-2-ynyl oxime (1b) in the presence of 10 mol % CuBr in toluene at 100 degrees C for 24 h gave (E)-4-benzylidene-1,3-diphenylazetidin-2-one (2b) in 96% yield. (13)C labeling experiments suggest that the present reaction proceeds through bond cleavage of five different covalent bonds: C=N, N-O, C-O, C-C, and C[triple bond]C.[1]


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