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Open Access Stereoselective Syntheses of Protected Amino-hydroxy-cyclopentane-carbaldehyde Derivatives from 7-Oxabicyclo[2.2.1]hept-5-en-2-yl Systems

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Cycloaddition of azido formates to the double bond of 7-oxabicyclo[2.2.1]hept-5-en-2-yl derivatives gave mixtures of triazolines that could be separated by chromatography. Their acid-catalyzed dediazoniations generate 7-oxabicyclo[2.2.1]hept-2-yl cation intermediates that rearrange into the corresponding more stable 2-oxabicyclo[2.2.1]hept-3-yl cation intermediates which are quenched externally or internally to give products that are protected amino-hydroxy-cyclopentane-carbaldehyde derivatives, with high stereoselectivity. The migratory aptitude of an alkyl group (e.g. σ bond C(1)–C(6) in 5-oxo-7-oxabicyclo[2.2.1]hept-2-yl cation intermediates) is significantly lower than that of the acyl group (e.g. σ bond C(1)–C(6) in 6-oxo-7-oxabicyclo[2.2.1]hept-2-yl cation intermediates) in pinacolic rearrangements.

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Document Type: Research Article

Publication date: 1990-10-01

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

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