Triphenylphosphine → (R)-3-[5-Chloro-2-[1-(3-trifluoromethyl-phenyl)-ethoxy]-phenoxy]-azetidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To (S)-1-(3-trifluoromethyl-phenyl)-ethanol (2.30 g, 12.1 mmol), 3-(5-chloro-2-hydroxy-phenoxy)-azetidine-1-carboxylic acid tert-butyl ester (3.80 g, 12.7 mmol) and PPh3 (3.80 g, 14.5 mmol) in THF (60 mL) at 0° C. was added DEAD (2.3 g, 2.1 mL, 13 mmol) in THF (10 mL) dropwise over 30 min. After 48 h, the reaction was concentrated and 15% EtOAc in hexanes was added. The flask was cooled to 0° C. and filtered. The filtrate was concentrated and this procedure repeated 2 more times. The resulting oil was then purified using silica gel chromatography (10-40% EtOAc in hexanes) to give 5.17 g (91%) of the title compound as a clear oil. 1H NMR (CDCl3): 7.66 (s, 1H), 7.56-7.53 (m, 2H), 7.46 (t, J=7.7 Hz, 1H), 6.79 (dd, J=8.6, 2.4 Hz, 1H), 6.71 (d, J=8.6 Hz, 1H), 6.52 (d, J=2.4 Hz, 1H), 5.29 (q, J=6.5 Hz, 1H), 4.88-4.82 (m, 1H), 4.33-4.29 (m, 2H), 4.08-4.01 (m, 2H), 1.67 (d, J=6.5 Hz, 3H), 1.46 (s, 9H).

Provenance & Evidence