Abstract

Valuable chiral sources of C(10)-substituted camphors and C(10)-substituted fenchones can be straightforwardly obtained by treatment of an appropriate, easily obtainable, camphor- or fenchone-derived 2-methylenenorbornan-1-ol with an electrophilic reagent. The process takes place via a tandem regioselective carbon-carbon double-bond addition/stereocontrolled Wagner-Meerwein rearrangement. A complete study of the enantiospecificity, scope, and limitations of this process, as well as about the role played by the hydroxyl group attached at the C(1) bridgehead position of the starting 2-methylenenorbornan-1-ols, has been realized. The feasibility of the described methodology has been exemplified by the highly efficient enantiospecific preparation of several interesting C(10)-halogen-, C(10)-O-, C(10)-S-, C(10)-Se-, or C(10)-C-substituted camphors and fenchones.

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