Triethylamine → HCID 71599882, compound

Participants

Reaction Steps

To a stirred solution of ethyl 3,4-bis(benzyloxy)-5-carbamoyl-1-(4-fluorophenyl)-1H-pyrrole-2-carboxylate (15) (1.1 g, 2.25 mmol) [prepared using the same procedure as Example B step (v) using triethylammonium 3,4-bis(benzyloxy)-5-(dimethylcarbamoyl)-1-(4-fluorophenyl)-1H-pyrrole-2-carboxylate and ammonium chloride] and triethylamine (1.26 mL, 9.0 mmol) in DCM (60 mL) at 0° C. was added trifluoroacetic anhydride (0.48 mL 3.38 mmol). The reaction mixture was allowed to warm to RT and partitioned between 1M HCl (aq.) (25 mL) and DCM (50 mL) the organic layer was washed with 1M HCl (aq.), and sat. NaHCO3 (aq.) (25 mL), dried (MgSO4), filtered and the volatiles removed in vacuo to afford the crude product. The crude residue was purified by silica gel chromatography (40 g, 0-20% EtOAc in isohexane) to afford ethyl 3,4-bis(benzyloxy)-5-cyano-1-(4-fluorophenyl)-1H-pyrrole-2-carboxylate (UL1-060) (1.01 g, 94%) as yellow solid: m/z 471 (M+H)+ (ES+). 1H NMR (400 MHz, DMSO-d6) δ: 7.57-7.27 (m, 14H), 5.27 (s, 2H), 5.11 (s, 2H), 4.05 (q, J=7.1 Hz, 2H), 1.00 (t, J=7.1 Hz, 3H).

Provenance & Evidence