The first and efficient total syntheses of (±)-triptoquinone B 1 and C 2 have been achieved from the allyl ether 3; the key steps are the construction of the four contiguous stereogenic centres present in 2 by the MnIII mediated oxidative free radical cyclisation followed by metal hydride reduction.
K. Shishido, K. Goto, A. Tsuda, Y. Takaishi and M. Shibuya, J. Chem. Soc., Chem. Commun., 1993, 793 DOI: 10.1039/C39930000793
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