Enantioselective synthesis of both the enantiomeric forms of the hydrindane derivatives mentioned in the title, potential chiral precursors in terpenoid synthesis, starting from R-carvone employing two different cyclopentannulation methodologies is described.
Bridged Systems via Radical Cyclization Reactions. Stereospecific Synthesis of Chiral Tricyclo[6.2.1.0<sup>1,5</sup>]undecanes<sup>1</sup>
作者:A. Srikrishna、T. Jagadeeswar Reddy
DOI:10.1021/jo960423c
日期:1996.1.1
Chiral synthons from carvone. Part 50.† Enantiospecific approaches to both enantiomers of bicyclo[4.3.0]nonane-3,8-dione derivatives
作者:A. Srikrishna、T. Jagadeeswar Reddy
DOI:10.1039/b104253j
日期:——
isopropenyl group followed by cyclopropane cleavage and cuprate addition generated the dione (−)-12a. Whereas, a Wacker mediated cyclopentannulation of (R)-carvone via the dione 15 furnished the enone 17. Functional group manipulation including the degradation of isopropenyl group transformed the enone 17 into the dione (+)-12a, which on regioselective ketalisation generated the ketoketal (+)-2.
Enantiospecific synthesis of (+)-(1S,2R,6S)-1,2-dimethylbicyclo[4.3.0]nonan-8-one and (−)-7-epibakkenolide-A
作者:A. Srikrishna、T. Jagadeeswar Reddy
DOI:10.1016/s0040-4020(98)00672-3
日期:1998.9
oxidation, ozonation-Criegee rearrangement as key reactions. Intramolecular aldol condensation followed by catalytic hydrogenation converted the diketone 12 into the bicyclicketone (+)-3, the optical antipode of the compound derived from the sesquiterpenes bakkenolide-A and fukinone. A 5-exo-dig radical cyclisation based strategy transformed the bicyclicketone 3 into chiral 7-epibakkenolide-A.