1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 1'-isopropyl-1-(2-methyl-2H-indazole-5-carbonyl)-4',6'-dihydrospiro[piperidine-4,5'-pyrazolo[3,4-c]pyridin]-7'(1'H)-one

To a solution of 2-methyl-2H-indazole-5-carboxyllic acid (28 mg, 0.16 mmol) in dry dimethylformamide was added 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (37 mg, 0.19 mmol) and 1-hydroxybenzotriazole (26 mg, 0.19 mmol) N,N-diisopropylethylamine (84 μL, 0.48 mmol). The reaction mixture was stirred at room temperature for 10 minutes and then 1′-isopropyl-4′,6′-dihydrospiro[piperidine-4,5′-pyrazolo[3,4-c]pyridin]-7′(1′H)-one hydrochloride was added (Intermediate 2, 30 mg, 0.12 mmol) and the reaction was stirred for 16 hours. The mixture was poured into chilled water and the resulting precipitate was collected by vacuum filtration. The obtained solid was triturated from diethyl ether to afford 1′-isopropyl-1-(2-methyl-2H-indazole-5-carbonyl)-4′,6′-dihydrospiro[piperidine-4,5′-pyrazolo[3,4-c]pyridin]-7′(1′H)-one (25 mg). +ESI (M+H) 407.3; 1H NMR (400 MHz, DMSO-d6, δ): 8.41 (s, 1H), 7.85 (s, 1H), 7.75 (s, 1H), 7.63 (d, 1H), 7.40 (s, 1H), 7.20 (s, 1H), 5.40 (m, 1H), 4.18 (s, 3H), 3.60 (br. s., 4H), 2.85 (s, 2H), 1.70 (br. s., 4H), 1.35 (d, 6H).

1. stirringthe reaction was stirred for 16 hours
2. additionThe mixture was poured
3. filtrationthe resulting precipitate was collected by vacuum filtration
4. customThe obtained solid was triturated from diethyl ether

ORD record

ord-838873937ab74e58ba6c0d38bbf89298

Source dataset

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08993586B2