Potassium Carbonate → 5-{[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]methyl}-4-[4-(1H-indol-5-yl)-2-methylphenyl]-2,4-dihydro-3H-1,2,4-triazol-3-one

Participants

Reaction Conditions

Reaction Steps

A microwaveable vial was charged with 4-(4-bromo-2-methylphenyl)-5-{[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]methyl}-2,4-dihydro-3H-1,2,4-triazol-3-one (100 mg, 0.247 mmol), 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole (60.0 mg, 0.247 mmol), PdCl2(dppf) (9.03 mg, 0.012 mmol), K2CO3 (85 mg, 0.617 mmol), 1,4-dioxane (3 mL) and water (1 mL). The reaction was purged with nitrogen, sealed and heated in a microwave reactor at 150° C. for 30 min (LCMS indicated complete conversion of starting material to desired product). The reaction mixture was concentrated under reduced pressure and the residue was dissolved in DMSO, filtered through a syringe filter and purified by reverse phase HPLC (Gilson, YMC-Pack ODS-A C18 5 μm 75×30 mm column, 10-90% MeCN/water+0.1% TFA, 3×1 mL injections). The appropriate fractions were concentrated to remove a majority of the MeCN, leaving an aqueous suspension of product. The precipitate was collected by filtration, rinsed with minimal water and dried to constant weight under vacuum to provide the title product (58 mg, 0.131 mmol, 53.2% yield) as a white solid. MS(ES)+ m/e 442.2 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ ppm 11.73 (d, J=4.04 Hz, 1H), 11.21 (br. s., 1H), 7.90 (s, 1H), 7.74 (br. s., 1H), 7.57-7.67 (m, 1H), 7.43-7.54 (m, 2H), 7.32-7.43 (m, 2H), 6.51 (d, J=2.27 Hz, 1H), 3.60-3.89 (m, 1H), 3.47-3.59 (m, 1H), 3.39-2.86 (m, 2H), 2.28-2.49 (m, 3H), 2.13-2.21 (m, 3H), 1.96 (d, J=9.35 Hz, 1H), 1.41-1.75 (m, 2H), 0.60-0.76 (m, 4H).

Provenance & Evidence