Preparation of seven and larger membered heterocycles by electrophilic heteroatom cyclization

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Abstract
The preparation of seven and larger membered ring compounds from linear substrates is known to be a difficult process. We report results for the preparation of heterocycles with these ring sizes by electrophilic heteroatom cyclizations. Examination of the literature shows that the obtention of seven-membered compounds is possible in good yields by a proper choice of the electrophilic reagents, while for eight and larger membered compounds these cyclisations are possible only if steric constraints are introduced into the chain.

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