Acetic Acid → 1-cyclopropyl-5-(1,5-dimethyl-6-oxo-1,6-dihydropyridin-3-yl)-3-methyl-4-(3-(trifluoromethoxy)phenyl)-4,5-dihydropyrrolo-[3,4-c]pyrazol-6(1H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-acetyl-1-(1,5-dimethyl-6-oxo-1,6-dihydropyridin-3-yl)-5-(3-(trifluoromethoxy)-phenyl)pyrrolidine-2,3-dione (Step 91.1) (50 mg, 0.118 mmol) in Dioxane (1 mL) were added cyclopropylhydrazine hydrochloride (Step 17.2) (25.7 mg, 0.237 mmol) and TEA (0.082 mL, 0.592 mmol) and the resulting mixture was heated up and stirred at 120° C. for 2 hr. AcOH was added to acidify the reaction mixture and stirred at 100° C. for 30 min. The reaction was cooled down to RT and concentrated under reduced pressure. The residue was dissolved in EtOAc and washed with a saturated aq. NaHCO3 solution and brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The crude material was purified by silica gel column chromatography (CH2Cl2/(CH2Cl2/MeOH 19:1 NH3) 0-100%) to afford the title product (10 mg, 0.021 mmol, 18.1% yield) as yellow foam. tR: 1.03 min (LC-MS 2); ESI-MS: 459 [M+H]+ (LC-MS 2); 1H NMR (400 MHz, DMSO-d6) δ ppm 1.04 (d, J=6.3 Hz, 2H) 1.24 (br. s., 3H) 1.93 (s, 6H) 3.37-3.39 (m, 1H) 3.81 (br. s., 1H) 6.13 (s, 1H) 7.22-7.57 (m, 5H) 7.76 (br. s., 1H).

Provenance & Evidence