trans-acetonide controlled endo-selective intramolecular nitrone-alkene cycloaddition of hept-6-enoses: A facile entry to calystegines, tropanes, and hydroxylated aminocycloheptanes
2007
High-yielding endo-selective intramolecular nitrone−alkene cycloaddition (INAC) reactions of hept-6-enoses controlled by a trans-acetonide to give bridged bicyclo[4.2.1]isoxazolidines exclusively are realized for the first time. The cycloadducts were readily transformed into calystegine, tropane, and hydroxylated aminocycloheptane frameworks.
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