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2005
Other natural products
U 0800
An Anionic Polycondensation Strategy for the Synthesis of Dibenzoxanthenones:
Toward the Synthesis of Hypoxyxylerone. — The polycondensation de20- 214 Progress
veloped by Kjaer and coworkers for acetophenones is successfully extended to acetonaphthones for a new, flexible approach to hypoxyxylerone derivatives. The products
(V) and (VIII) are transformed to the hypoxyxylerone analogues (VI) and (IX). The
latter is found to inhibit topoisomerase I in vitro, albeit less so than the natural product.
Furthermore, the key intermediate (XI) of the title compound (XII) is prepared. —
(CHEVENIER, E.; LUCATELLI, C.; PANDYA, U.; WANG, W.; GIMBERT*, Y.;
GREENE, A. E.; Synlett 2004, 15, 2693-2696; Lab. Etud. Dyn. Struct. Sel., CNRS,
Univ. Joseph Fourier, F-38041 Grenoble, Fr.; Eng.) — Steudel
2005
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