Water → Tert-butyl 3-(4-(pyrrolidin-1-ylmethyl)phenoxy)azetidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of NaH (55-65% disp. in oil, 0.62 g, 14.3 mmol) in dry DMF (20 mL) under nitrogen was cooled by an ice-bath. A solution of 4-(pyrrolidin-1-ylmethyl)phenol—see e.g. Bioorganic & Medicinal Chemistry Letters, 15, 3834-3837 (2005)—(2.1 g, 11.9 mmol) in DMF (20 mL) was added drop-wise. The mixture was stirred for one h and then tert-butyl 3-[(methylsulfonyl)oxy]azetidine-1-carboxylate (3.9 g, 15.5 mmol) in DMF (10.0 mL) was added. The mixture was heated to 80° C. overnight and then cooled to RT. Water (150 mL) was added and the mixture was extracted three times with EtOAc (100 mL). The combined organic solutions were washed with brine, dried (MgSO4) and evaporated. The residue was purified twice by column chromatography on SiO2 using 10-100% EtOAc/heptane as eluent. The product was further purified using 0.5% NH3 in MeOH/DCM as eluent. There was obtained 2.5 g (64%) of 1A. 1H NMR (600 MHz, CDCl3): δ 1.43 (s, 9H), 1.77 (s, 4H), 2.47 (s, 4H), 3.54 (s, 2H), 3.95-4.02 (m, 2H), 4.24-4.30 (m, 2H), 4.82-4.88 (m, 1H), 6.67 (d, 2H), 7.23 (d, 2H).

Provenance & Evidence