A quick, high-yield synthesis of molnupiravir, an investigational COVID antiviral pill

A quick, high-yield synthesis of molnupiravir, an investigational COVID antiviral pill

As SARS-CoV-2 continues to spread and mutate, it’s important to identify new treatment options. Molnupiravir is an investigational oral antiviral being developed for the treatment of COVID-19, and has been submitted for review by the U.S. Food and Drug Administration. Researchers now report in ACS Central Science that they have engineered enzymes to help manufacture the pill, resulting in a much shorter and higher-yielding synthesis than current methods.

Originally developed to treat influenza, molnupiravir works by causing viruses to make errors when copying their own RNA, introducing mutations that inhibit replication. Recently, interim phase 3 clinical trial findings indicated that molnupiravir reduced the risk of hospitalization and death from COVID-19 for newly diagnosed, at-risk patients, and that it worked equally well against different SARS-CoV-2 variants. John McIntosh, Patrick Fier and colleagues at Merck and Codexis set out to develop a shorter, higher-yielding and sustainable way to synthesize the molecule.

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