Methanesulfonyl chloride → Methyl (3-bromo-5-fluorophenyl){1-[(S)-(4-chlorophenyl)(3-cyanophenyl)methyl]azetidin-3-ylidene}acetate

Participants

Reaction Steps

To a solution of 14.55 g (58.87 mmol) of methyl (3-bromo-5-fluorophenyl)acetate in 200 mL of THF at −78° C., was added a solution of 56.80 mL (56.80 mmol) (1M in THF) of LHMDS. After the reaction mixture was stirred for 30 min., a solution of 15.60 g (52.57 mmol) of 3-[(S)-(4-chlorophenyl)(3-oxoazetidin-1-yl)methyl]benzonitrile in 50 mL of THF was added and the mixture was stirred for 2.5 h at −78° C. Then 8.35 g (68.33 mmol) of DMAP, 14.65 mL (84.09 mmol) of DEA, and 8.72 mL (110.38 mmol) of methanesulfonyl chloride were added, and the mixture was stirred for 1 h at −78° C. The mixture was then allowed to warm to rt and was stirred at rt for 12 h. The mixture was poured into 300 mL of ether and 100 mL of water. The water layer was extracted with ether (100 mL×2). The combined organic layer was dried over Na2S04 and concentrated. The residue was purified by silica gel chromatography with hexanes/ethyl acetate to afford the title compound as a white solid; 1H-NMR(CDCl3) δ 3.75(s, 3H), 3.87(s, 2H), 4.23-4.29(m, 2H), 4.59(s, 1H), 6.92 (d, 1H, J=12 Hz), 7.18(s, 1H), 7.20 (d, 1H, J=12 Hz), 7.31-7.38 (dd, 4H, J J11=28.4 Hz, J2=8.5 Hz), 7.42 (t, 1H, J=7.7 Hz), 7.54 (d, 1H, J=7.6 Hz), 7.66 (d, 1H, J=7.6 Hz), 7.76 (s, 1H); Mass Spectrum: m/e=525, (M+1, 35Cl79Br), 527 (M+1, 37Cl79Br/35Cl81Br), 529 (M+1, 37Cl81Br).

Provenance & Evidence