Triethylamine → HCID 89610545, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of diethyl 3,4-bis(benzyloxy)-1-(4-methoxyphenyl)-1H-pyrrole-2,5-dicarboxylate (1) (39.6 g, 74.8 mmol) in THF/EtOH (300/50 mL) was added NaOH (3.07 g, 77 mmol) as a solution in water (20 mL). The reaction was stirred at 50° C. for 16 h. Triethylamine was added (30 mL, 215 mmol) and the volatiles were removed in vacuo. The residue was purified by silica gel chromatography (50% isohexane:DCM (+2% Et3N), then 20% MeOH/EtOAc (+2% Et3N)) to afford triethylammonium 3,4-bis(benzyloxy)-5-(ethoxycarbonyl)-1-(4-methoxyphenyl)-1H-pyrrole-2-carboxylate (5) (39.3 g, 83%) as a yellow oil: m/z 502 (M+H)+ (ES+); 500 (M−H)− (ES−). 1H NMR (400 MHz, DMSO-d6) δ: 7.51-7.26 (m, 10H), 7.11-7.05 (m, 2H), 6.92-6.83 (m, 2H), 5.09 (s, 2H), 5.06 (s, 2H), 3.95 (q, J=7.1 Hz, 2H), 3.79 (s, 3H), 2.85-2.62 (m, 6H), 1.08-0.92 (m, 12H).

Provenance & Evidence