What are the structure-activity relationships (SAR) of the 9,10-dihydrophenanthrene derivatives?

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Topic
The SAR studies were conducted to understand how different functional groups and substituents on the 9,10-dihydrophenanthrene scaffold affect the inhibitory activity against SARS-CoV-2 3CLpro.
Answer
The SAR studies revealed that the presence of bulkier groups at the R1 position, such as cyclohexyl and 4-Br phenyl, improved inhibitory activity. The conversion of the pyridine group to quinoline at the R3 position was favorable, while pyrimidine, pyrazole, and purine derivatives were unfavorable. The incorporation of 5-phenyl at the pyridyl group was crucial for high inhibitory activity.
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