Abstract
A new class of indole derivatives (3) have been identified as potent RSV fusion inhibitors. SAR exploration revealed that 5-Cl and the sulfonyl side chain of the indole scaffold are crucial for anti-RSV activity. Further optimization led to the discovery of a cyclic sulfone (8i) with 2 nM anti-RSV activity and a much improved PK profile compared to the non-cyclic sulfone counterpart.
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