... Volume: Page: ... Despite the absence of the P 1 glutamine side chain important for HAV 3C substrate/inhibitor recognition, β-lactones 5a and 5b are potent ... C to RT, 14% (unoptimized yield) (vi) H 2 , Pd/C, MeOH, 87%; (vii) DMAD, PPh 3 , THF, −78 °C to RT, 32%. ...