Abstract
Riccardin C, a nuclear receptor LXRα selective agonist, is an 18-membered macrocyclic bisbibenzyl isolated from several liverworts. Synthesis of riccardin C and its seven O-methylated derivatives was accomplished. The synthetic sequence highlights an intramolecular Suzuki–Miyaura coupling in the formation of the 18-membered biaryl linkage present in riccardin C. The structure–activity relationship of these compounds suggests that all of the phenolic hydroxy groups present in riccardin C are essential for the activation of LXRα.
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