The (±)-trimethyl ether of the unusual isochromeno[4,3-b]chromene peltogynol 1(R = OMe) and its ring skeleton 1(R = H) have been synthesized via 6-endo intramolecular cyclisation of the radicals derived from the 3-(o-iodobenzyloxy)chromones 17(R = OMe) and 17(R = H ) respectively. The spiroketone 13 can be prepared similarly from 2-(o-iodophenoxymethyl)chromone 12.
S. A. Ahmad-Junan and D. A. Whiting, J. Chem. Soc., Perkin Trans. 1, 1992, 675 DOI: 10.1039/P19920000675
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