Triethylamine → 4-(2-chloro-5-fluorophenyl)-1-pivaloyl-2-phenyl-2,5-dihydro-1H-pyrrole

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Reaction Steps

Triethylamine (149 μL, 1.07 mmol, 10.00 equiv) and pivaloyl chloride (26 μL, 0.214 mmol, 2.00 equiv) were added sequentially to a solution of 4-(2-chloro-5-fluorophenyl)-2-phenyl-2,5-dihydro-1H-pyrrole (1-5, 0.107 mmol, 1 equiv) in dichloromethane (10 mL) at 23° C., and the resulting mixture was stirred for 20 minutes. The reaction mixture was concentrated and the residue purified by reverse-phase LC (H2O/CH3CN gradient w/0.1% TFA present) to provide 4-(2-chloro-5-fluorophenyl)-1-(2,2-dimethylpropanoyl)-2-phenyl-2,5-dihydro-1H-pyrrole (10-1) as a tan solid. 1H NMR (300 MHz, CDCl3) δ 7.39 (dd, 1H, J=8.8, 5.2 Hz), 7.33 (m, 4H), 7.26 (m, 1H), 7.05 (dd, 1H, J=9.2, 3.1 Hz), 6.99 (m, 1H), 6.20 (m, 1H), 5.98 (m, 1H), 5.00 (m, 2H), 1.28 (s, 9H). LRMS m/z (M+H) 358.0 found, 358.1 required.

Provenance & Evidence