From ring to ring: The first total synthesis of (+)‐daphmanidin E features rapid access to an enantiomerically pure bicyclo[2.2.2]octadione and elaboration around its periphery through the implementation of two Claisen rearrangements, the use of a copper/peptide complex for reagent‐controlled stereoselective conjugateaddition, a diastereoselective hydroboration, and a cobalt‐catalyzed alkyl‐Heck cyclization
Synthesis of Optically Active <i>endo</i>,<i>endo</i> Bicyclo[2.2.2]octane-2,5-diol, Bicyclo[2.2.2]octane-2,5-dione, and Related Compounds
作者:Fredrik Almqvist、Niklas Ekman、Torbjörn Frejd
DOI:10.1021/jo9601167
日期:1996.1.1
5S)-bicyclo[2.2.2]octane-2,5-diol ((+)-12; 98% ee) and several selectively protected optically active intermediates useful for synthetic transformations were synthesized via a 1,2-carbonyl transposition route starting from the easily available optically active (1R,4S,6S)-6-hydroxybicyclo[2.2.2]octan-2-one ((-)-2). The synthetic route also allowed the preparation of optically active (1S,4S)-bicyclo[2.2.2]octane-2