Abstract
The protein kinase C-activating sponge natural product alotaketal C (1) potently inhibits the infection of human Calu-3 lung cells by SARS-CoV-2 Omicron BA.1 and BA.5 variants. Simplified analogs of 1 have been synthesized and tested for anti-SARS-CoV-2 activity providing SAR data for the antiviral pharmacophore of 1. Analogs 19 and 23, which are missing the C-11 substituents in 1 and have modified C-13 appendages, are ∼2- to 7-fold more potent than 1 and have equal or larger selectivity indices.
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