Cyclopentanone → Methyl 3-(cyclopentylamino)-2,2-difluoropropanoate

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Reaction Steps

To a round bottom flask was added methyl 3-amino-2,2-difluoropropanoate (570 mg, 3.24 mmol), THF (20 mL), cyclopentanone (0.433 mL, 4.87 mmol), and HOAc (1 mL). To this mixture was added sodium triacetoxyborohydride (1.06 g, 5 mmol) portionwise. The reaction was left to stir overnight. It was then added slowly to a stirring solution of ice, NaHCO3 (sat.), and EtOAc. The aqueous layer was further extracted with EtOAc, the organic extracts combined, dried over MgSO4, filtered and concentrated to yield the desired product as clear syrup (400 mg, 60%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.30 (td, J=13, 6 Hz, 2H) 1.43 (d, J=8 Hz, 1H) 1.47-1.70 (m, 4H) 1.77 (dt, J=12, 6 Hz, 2H) 3.12 (t, J=6 Hz, 1H) 3.19 (t, J=14 Hz, 2H) 3.88 (s, 3H).

Provenance & Evidence