Trifluoroacetic acid → 6'-Morpholino-1',2,2',3,5,6-hexahydrospiro[pyran-4,3'-pyrrolo[3,2-b]pyridine]

Participants

Reaction Steps

To a stirred solution of tert-butyl 6′-morpholino-2,3,5,6-tetrahydrospiro[pyran-4,3′-pyrrolo[3,2-b]pyridine]-1′(2′H)-carboxylate (5.8 g, 15.45 mmol) in DCM (30 mL) was added TFA (23.80 mL, 309 mmol) and the reaction was stirred at rt for 3 h. After this time the reaction was evaporated under reduced pressure and dried under vacuum overnight. After this time the reaction was partitioned between EtOAc (80 mL) and 1.0M aqueous HCl (200 mL). The separated aqueous layer was washed with EtOAc (40 mL). The aqueous layer was then basified to pH 14 with aqueous NaOH and extracted with EtOAc (2×200 mL) and DCM (100 mL). The combined organic layers were dried over MgSO4, filtered and evaporated in vacuo to give 6′-morpholino-1′,2,2′,3,5,6-hexahydrospiro[pyran-4,3′-pyrrolo[3,2-b]pyridine] as a white solid. Mass Spectrum (ESI) m/e=276.2 (M+1)

Provenance & Evidence