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Treatment of N-vinyl-α,β-unsaturated amides 1a–h with Bu 3 SnH and a catalytic amount of AIBN in boiling benzene caused 5-exo cyclization of allylic O-stannyl ketyl radicals generated by addition of Bu 3 Sn· on the amide-oxygen atoms to provide γ-lactams 2a–h after acidic workup. When enamide 1d was treated with Bu 3 SnH in the presence of AIBN followed by aldehydes 3a–d, sequential...
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