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Chemoselectivity in the addition and cyclization reactions of PhSO 2 Br to N -allyl acrylamides has been confirmed due to the higher reactivity of the acrylic C C bond toward the sulfonyl radical than that of the allyl C C bond. Formation of γ-lactams by C β →C α cyclization can be achieved with N -allyl 3,3-dimethylacrylamides.
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Wang et al. (1999) studied this question.
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