Abstract
A new and general method of iodine-mediated cyclization reactions of unsaturated carbamates, ureas and amides which gives N-cyclized products as a single regio-isomer was achieved. The present reaction proceeds in good yield through regio-control of an ambident nucleophile by LiAl(O t-Bu) 4, and the regio-control ( N-attack vs O-attack) was also found to be remarkably affected by the additive employed.
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