(S)-tert-butyl 2-(5-iodo-1H-imidazol-2-yl)pyrrolidine-1-carboxylate → HCID 178451909, compound

Participants

Reaction Conditions

Reaction Steps

A 100 mL pressure vessel equipped with a magnetic stir bar was charged with 2,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)naphthalene (2.00 g, 5.26 mmol), (S)-tert-butyl 2-(5-iodo-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (2.10 g, 5.79 mmol) and Pd(Ph3P)4 (0.058 g, 0.05 mmol) in DME (47.8 mL) and water (4.8 mL). The solution was degassed under vacuum for 5 min and the reactor was back filled with nitrogen. The vessel was sealed and the reaction mixture was heated overnight at 120° C. The reaction was cooled to room temperature and the volatiles were removed under. The residue was partitioned between water and EtOAc and the water layer was extracted with additional EtOAc. The combined organic layers were dried (Na2SO4), filtered, and concentrated. The crude product was purified with a BIOTAGE® (dry loaded onto a 90 g silica gel cartridge and eluted with a gradient of 0 to 30% EtOAc in DCM) and repurified with a BIOTAGE® (dry loaded onto a 80 g silica gel cartridge and eluted with a gradient of 0 to 50% EtOAc in DCM) to yield (S)-tert-butyl 2-(4-(6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)naphthalen-2-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (949 mg) as a yellow solid. The material (contaminated with (2S,2′S)-tert-butyl 2,2′-(4,4′-(naphthalene-2,6-diyl)bis(1H-imidazole-4,2-diyl))dipyrrolidine-1-carboxylate) was used in the next step without further purification. LC-MS retention time 1.760 min; m/z 490.21 [M+H]+. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Waters Sunfire 5u C18 4.6×50 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 4 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 3 min, a hold time of 1 min and an analysis time of 4 min where Solvent A was 10% acetonitrile/90% water/0.1% TFA and Solvent B was 90% acetonitrile/10% water/0.1% TFA. MS data was determined using a MICROMASS® Platform for LC in electrospray mode.

Provenance & Evidence