Diisopropylethylamine → Tert-butyl 4-((3,3-difluoropyrrolidin-1-yl)methyl)piperidine-1-carboxylate

Participants

Reaction Steps

A mixture of 3,3-difluoropyrrolidine hydrochloride (965 mg, 6.722 mmol), tert-butyl 4-formylpiperidine-1-carboxylate (1.720 g, 8.066 mmol), DIPEA (955.6 mg, 1.288 mL, 7.394 mmol) and crushed 4A MS (965 mg) in DCE (30 mL) were stirred at ambient temperature for 3 hours. NaBH(OAc)3 (2.848 g, 13.44 mmol) was added and the reaction stirred at ambient temperature for a further 16 hours. The mixture was filter through Celite (washing with DCM) and the filtrate concentrated in vacuo. The residue was purified by column chromatography (ISCO Companion, 80 g column, eluting with 0 to 10% MeOH/DCM, loaded in DCM) to give the sub-title product as a colourless oil that was used directly into next step without further purification. LC-MS ES+: 305.1.

Provenance & Evidence