Potassium Carbonate → 1'-Benzyl-2-oxo-6-(4-phenoxyphenyl)-1,2-dihydrospiro[imidazo[1,2-b]pyrazole-3,4'-piperidine]-7-carbonitrile

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Reaction Steps

A mixture of ethyl 1-benzyl-4-hydrazinylpiperidine-4-carboxylate hydrochloride (350 mg, 1.0 mmol), 2-(methoxy(4-phenoxyphenyl)methylene)malononitrile (276 mg, 1.0 mmol) and K2CO3 (414 mg, 3.0 mmol) in MeOH (20 mL) was heated to reflux for 16 hr. The mixture was filtered and the filtrate was concentrated to give the crude product (280 mg, 58.9%) as a yellow solid. MS (ESI, m/e) [M+1]+ 475.9.

Provenance & Evidence