B. Yagen et al., TANDEM SILICA GEL-CATALYZED REARRANGEMENTS AND SUBSEQUENT BAEYER-VILLIGER REACTIONS OF ARTEMISININ DERIVATIVES, Journal of the Chemical Society. Perkin transactions. I, (7), 1994, pp. 843-846
Novel silica gel-catalysed reactions of dihydroartemisinin 1b to deoxy
artemisinin 11 and 11 beta-hydroxy-11-epidihydroartemisinin 8 to compo
und 9 under mild conditions are described. The structures of the produ
cts were determined by mass spectrometry and 1D- and 2D-NMR spectrosco
py. A mechanism for their formation is proposed.