Potassium Carbonate → (S)-tert-butyl 2-(5-ethynyl-1H-imidazol-2-yl)pyrrolidine-1-carboxylate

Participants

Reaction Steps

(S)-tert-Butyl 2-(5-((trimethylsilyl)ethynyl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (537 mg, 1.61 mmol) was dissolved into MeOH (20 mL) and then potassium carbonate (22 mg, 0.16 mmol) was added and the reaction was stirred at rt for 3 h. The reaction was concentrated, dissolved into dichcloromethane, loaded onto a SiO2 column and purified by BIOTAGE® Horizon (30-50% EtOAc/hexanes) to yield (S)-tert-butyl 2-(5-ethynyl-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (346 mg, 1.32 mmol, 82% yield) as an off-white solid. LC-MS retention time 0.878 min; m/z 260.35 (MH−). LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a PHENOMENEX® Luna 10u C18 3.0×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 2 min, a hold time of 1 min, and an analysis time of 3 min where Solvent A was 5% acetonitrile/95% H2O/10 mM ammonium acetate and Solvent B was 5% H2O/95% acetonitrile/10 mM ammonium acetate. MS data was determined using a MICROMASS® Platform for LC in electrospray mode. 1H NMR (400 MHz, CDCl3) δ ppm 7.21-7.17 (m, 1H), 4.92-4.87 (m, 1H), 3.43-3.30 (m, 2H), 3.05 (s, 1H), 3.03-2.85 (m, 1H), 2.20-1.88 (m, 3H), 1.60-1.45 (m, 9H).

Provenance & Evidence