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Scheme 2. Synthesis
of Alkyne Derivatives of the Investigational COVID-19 Therapeutics
GC376 (3) and MI-09 (4).
Reagents and conditions:
(a) 16(27) or 17, COMU,55 NMM, DMF/CH2Cl2, 0 °C
to rt, 14 and 13%, respectively; (b) COMU,55 NMM, DMF/CH2Cl2, 0 °C to rt, 33%.