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The synthesis of furano-rotenoid, pongarotene, by oxidative 1,2-aryl rearrangement of the sprirochromanone ( 11 ) using thallium(III)  p -tosylate as key step has been described. Pongarotene ( 12 ) structure was confirmed by 2D NMR, HRMS and finally by X-ray crystallography. The sprirochromanones were synthesized by radical cyclization of chromone derivative ( 10 ). This methodology will be useful for the synthesis of naturally occurring rotenoids.

Novel synthesis of rotenoid, pongarotene, by oxidative rearrangement using thallium(III) p -tosylate