Abstract
When tosyl bromide is added under free radical conditions to β-allenyl-1-phenylketoximebenzoates, a carbon-centred radical resulting from the addition of the tosyl radical on the sp carbon is formed. Depending on the substitution pattern of the allenyl moiety, this carbon-centred radical traps a bromine atom or undergoes a rare 6- endo cyclisation onto the nitrogen atom leading to 3,6-dihydropyridines in good yields.
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