Abstract
Abstract The syntheses of carba-analogues of qinghaosu 7, 8, 9 are first described. Arteannuic acid 11 was converted into key intermediate cyclic enol ether 14 in four steps. Reaction of 14 with paraformadehyde under the catalysis of Lewis acid BF 3 ·OEt 2 afforded 7 . Oxidation of 7 with RuO 4 gave 8 and 9 .
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