Chlorosuccinimide → (2Z)-2-[5-chloro-2-[(2-methylpropan-2-yl)oxycarbonylamino]-1,3-thiazol-4-yl]-2-[2-methyl-1-[(2-methylpropan-2-yl)oxy]-1-oxopropan-2-yl]oxyiminoacetic acid

Participants

Reaction Steps

A solution of (Z)-2-(((1-(tert-butoxy)-2-methyl-1-oxopropan-2-yl)oxy)imino)-2-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)acetic acid (70 g, 147 mmol) and NCS (23.50 g, 176 mmol) in N,N-Dimethylformamide (DMF) (735 mL) was stirred at 40° C. for 2.5 h. The reaction was quenched by addition of H2O (2 L), EtOAc (1 L) and 5% aq. sodium thiosulfate soln (400 mL). The organic layer was separated, and washed with H2O (2×), brine, dried and evaporated to afford (Z)-2-(((1-(tert-butoxy)-2-methyl-1-oxopropan-2-yl)oxy)imino)-2-(2-((tert-butoxycarbonyl)amino)-5-chlorothiazol-4-yl)acetic acid (69 g, 91% purity, 135 mmol, 92% yield) as a light yellow foaming solid. LCMS: (M+H)+: 464.2

Provenance & Evidence