Hydrochloric Acid → 1-{[(S)-2-(3-Trifluoromethoxy-phenylcarbamoyl)-pyrrolidine-1-carbonyl]-amino}-indolizine-3-carboxylic acid benzyl ester

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Reaction Steps

To a solution of (S)-pyrrolidine-2-carboxylic acid (3-trifluoromethoxy-phenyl)-amide TFA salt (328 mg, 0.845 mmol) and triethylamine (353 μl, 2.54 mmol) in THF (10 mL) was added the crude 1-isocyanato-indolizine-3-carboxylic acid benzyl ester (247 mg, 0.845 mmol, prepared as described in Scheme A6). The resulting mixture was stirred at RT under nitrogen over the week-end then poured into HCl 1N and extracted with EtOAc (×3). The combined organic extracts were washed with an aqueous saturated solution of NaHCO3, dried (Na2SO4), filtered and concentrated. The crude mixture was purified by flash column chromatography on silica gel (c-hexane/EtOAc 1:1 to c-hexane/EtOAc 3:7) to afford the desired compound. TLC, Rf (c-hexane/EtOAc 1:1)=0.3; MS (LC/MS): 567.3 [M+H]+ 565.2 [M−H]−; tR (HPLC conditions a): 4.16 min.

Provenance & Evidence