Dimethyl Sulfoxide → HCID 67366301, compound

Participants

Reaction Steps

A solution of oxalyl chloride (0.3 mL, 3.5 mmol) in CH2Cl2 (0.5 mL) was added dropwise to a solution of DMSO (0.34 mL, 4.8 mmol) in CH2Cl2 (1.5 mL) at −65° C. and stirred for 10 min. The resultant solution was added to a suspension of 1-[2-(4-fluorophenyl)-2-hydroxyethyl]-5-methyl-1H-pyrrole-2-carboxylic acid (211 mg, 0.8 mmol) in CH2Cl2 (10 mL) at −65° C. The resultant suspension was stirred at −65° C. for 15 min, then triethylamine (1.12 mL, 8.0 mmol) was added drop-wise. Once the addition was complete the reaction mixture was allowed to warm to room temperature and stirred for 2 hours. The reaction was then quenched by the addition of CH2Cl2 (50 mL) and water (10 mL), the organic layer was separated and the aqueous extracted with further CH2Cl2 (10 mL). The organic layers were combined and washed with brine, dried (MgSO4), filtered and concentrated in vacuo to give a brown solid. The solid was purified by flash column chromatography (Biotage SP4, 40 g cartridge, hexane 1 CV, 0-50% EtOAc/hexanes 10 CV) to give (methylsulfanyl)methyl 1-[2-(4-fluorophenyl)-2-oxoethyl]-5-methyl-1H-pyrrole-2-carboxylate as a off-white solid (162 mg, 62%). 1H NMR (400 MHz, CDCl3): δ 2.19 (s, 3H), 2.22 (s, 3H), 5.19 (s, 2H), 5.76 (s, 2H), 6.06 (dd, 1H, J 3.9, 0.7 Hz), 7.06 (d, 1H, J 3.9 Hz), 7.13-7.24 (m, 2H), 8.06 (dd, 2H, J 9.0, 5.3 Hz). ESI-MI m/z [M+H]+ 321.80.

Provenance & Evidence