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A Mild Method for Dehydration of a Base-Sensitive Primary Amide- Toward a Key Intermediate in the Synthesis of Nirmatrelvir

Nirmatrelvir, the active ingredient of the Pfizer drug Paxlovid (Figure 1), is an inhibitor of the SARS-CoV-2 main protease enzyme.1 A key transformation- the final synthetic step in the synthesis of Nirmatrelvir- is dehydration of a primary amide (Figure 2).The amide starting material is prepared by reaction of the corresponding ester with ammonia.2 Various methods

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