Hydrochloric Acid → 2'-(tert-Butyl)-4',6'-dihydrospiro[piperidine-4,5'-pyrazolo[3,4-c]pyridin]-7'(2'H)-one hydrochloride

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Reaction Steps

To a solution of tert-butyl 2′-tert-butyl-7′-oxo-2′,4′,6′,7′-tetrahydrospiro[piperidine-4,5′-pyrazolo[3,4-c]pyridine]-1-carboxylate (70 mg, 0.19 mmol) in ethyl acetate (5 mL) was added 4 M hydrochloric acid in 1,4-dioxane (2 mL) and the mixture was stirred 3 hours at room temperature. The volatiles were removed under reduced pressure and the resultant colorless solid was triturated from heptanes (10 mL) and dried under reduced pressure to yield 2′-tert-butyl-4′,6′-dihydrospiro[piperidine-4,5′-pyrazolo[3,4-c]pyridin]-7′(2′H)-one hydrochloride salt (56 mg) as an off-white solid. +ESI (M+H) 263.1; 1H NMR (500 MHz, DMSO-d6, δ): 8.72 (m, 2H), 7.92 (s, 1H), 7.75 (s, 1H), 3.20 (br. s, 2H), 3.09 (br. s., 2H), 2.78 (s, 2H), 1.79 (m, 4H), 1.48 (s, 9H).

Provenance & Evidence