Thyromimetics that specifically target TRβ have been shown to reduce plasma cholesterol levels and avoid atherosclerosis through the promotion of reverse cholesterol transport in an animal model. We designed novel thyromimetics with high receptor (TRβ) and organ (liver) selectivity based on the structure of eprotirome (3) and molecular modeling. We found that indane derivatives are potent and dual-selective thyromimetics expected to avoid hypothyroidism in some tissues as well as heart toxicity. KTA-439 (29), a representative indane derivative, showed the same high human TRβ selectivity in a binding assay as 3 and higher liver selectivity than 3 in a cholesterol-fed rat model.
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