An efficient approach to the preparation of natural (+/-)-gneafricanin F and the first synthesis of (+/-)-gnemonol M were developed. The regioselective, oxidative coupling of 5-tert-butyl-isorhapontigenin catalyzed by FeCl3 center dot 6H(2)O in different solvent systems was used as the key synthetic step.
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Li et al. (2010) studied this question.