Acetic Acid → (R)-tert-butyl 4-(4-(2-(cyclopropanecarboxamido)pyrazolo[1,5-a]pyridin-4-yl)benzyl)-3-methylpiperazine-1-carboxylate

Participants

Reaction Steps

N-(4-(4-Formylphenyl)pyrazolo[1,5-a]pyridin-2-yl)cyclopropanecarboxamide (122 mg, 0.4 mmol), (R)-tert-butyl 3-methylpiperazine-1-carboxylate (120 mg, 0.6 mmol) and (polystyrylmethyl)trimethylammonium cyanoborohydride (loading 4 mmol/g, 0.3 g, 1.2 mmol) were shaken in DCM (15 mL) and acetic acid (1.5 mL) at room temperature for 5 d. The beads were filtered off and the filtrate concentrated in vacuo to give (R)-tert-butyl 4-(4-(2-(cyclopropanecarboxamido)pyrazolo[1,5-a]pyridin-4-yl)benzyl)-3-methylpiperazine-1-carboxylate which was used in the next step without further purification.

Provenance & Evidence