A new strategy for highly diastereoselective synthesis of furo[3,2-b]-beta-lactams and furo[3,2-b]-gamma-lactams via a novel Ag(I)-mediated intramolecular 1,3-dipolar cycloaddition of oxo-N-propargylamides, is developed and the possible mechanism of these transformation is proposed.
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Zhang et al. (2010) studied this question.
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