[C:1]([O:5][C:6]([NH:8][C@H:9]([C:13]1[CH:17]=[CH:16][S:15][CH:14]=1)[C:10](O)=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].N1C=CC=CC=1.N1C(F)=NC(F)=NC=1[F:26]>C(Cl)Cl>[F:26][C:10](=[O:11])[C@H:9]([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:4])([CH3:3])[CH3:2])[C:13]1[CH:17]=[CH:16][S:15][CH:14]=1To (R)-2-(tert-butoxycarbonylamino)-2-(thiophen-3-yl)acetic acid in CH2Cl2 cooled to −10° C. was added pyridine and cyanuric fluoride. The solution was stirred for 1 hour at −10° C., quenched with ice and extracted with CH2Cl2 and ice cold water, dried (Na2SO4), filtered and evaporated to give (R)-tert-butyl 2-fluoro-2 oxo-1-(thiophen-3-yl)ethylcarbamate.
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