Hydrazine, cyclopropyl-, hydrochloride (1:1) → 4-(4-chlorophenyl)-1-cyclopropyl-5-(3,8-dimethyl-[1,2,4]triazolo[4,3-a]pyridin-6-yl)-3-methyl-4,5-dihydropyrrolo-[3,4-c]pyrazol-6(1H)-one

Participants

Reaction Steps

A mixture of 4-acetyl-5-(4-chlorophenyl)-1-(3,8-dimethyl-[1,2,4]triazolo[4,3-a]pyridin-6-yl)-3-hydroxy-1H-pyrrol-2(5H)-one (Step 92.1) (630 mg, 1.588 mmol) and cyclopropylhydrazine hydrochloride (517 mg, 4.76 mmol) in EtOH (8 mL) and toluene (8 mL) was stirred for 2 hr at reflux. The reaction mixture was concentrated, diluted with CH2Cl2/saturated aq. NaHCO3 solution, and extracted with CH2Cl2. The combined organic layers were washed with water and brine, dried over Na2SO4 and evaporated. The crude material was purified by silica gel column chromatography (1% ammonia/5% MeOH/CH2Cl2) to afford the title product (412 mg, 0.952 mmol, 59.9% yield) as a yellow foam. tR: 0.95 min (LC-MS 2); ESI-MS: 433 [M+H]+ (LC-MS 2); Rf=0.28 (1% ammonia/5% MeOH/CH2Cl2); 1H NMR (400 MHz, DMSO-d6) δ ppm 0.98-1.11 (m, 2H) 1.18-1.29 (m, 2H) 1.92 (s, 3H) 2.43 (s, 3H) 2.61 (s, 3H) 3.75-3.87 (m, 1H) 6.41 (s, 1H) 7.27-7.39 (m, 5H) 8.33-8.48 (m, 1H).

Provenance & Evidence