We present a novel route for the quick and easy synthesis of a broad range of β-lactams. The synthesis involves a [3+1] cyclization of amide dianions with diiodomethane. In contrast to the seminal work of Hirai et al. from 1979, the reaction proved to be a general and efficient approach towards azetidinones. The ease of the process was confirmed by DFT calculations and its power demonstrated by a diversity-oriented synthesis of β-lactams with four points of diversity determined by the choice of Ugi adducts as starting materials.
Keywords: Ugi reactions; amides; diiodomethane; diversity-oriented synthesis; β-lactams.
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