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N -Alkenyl β-ketoamides undergo cyclization in the presence of Au[P( t -Bu) 2 ( o -biphenyl)]Cl (5 mol %) and AgOTf (5 mol %) under mild conditions with excellent regioselectivities and yields. The reaction provides an efficient method to prepare highly substituted lactams.
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Zhou et al. (2007) studied this question.
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