4-Methylmorpholine → N-{[4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-hydroxyethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl}-D-seryl-D-serine

Participants

Reaction Steps

A solution of N-{[4-((2R,3R)-1-(4-fluorophenyl)-3-{[2-(4-fluorophenyl)-2-hydroxyethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl}-D-serine (0.008 g, 0.014 mmol), O-tert-butyl-D-serine tert-butyl ester hydrochloride (0.005 g, 0.019 mmol) and N-Methylmorpholine (0.006 ml, 0.055 mmol) in DCM (3 ml) was stirred for 5 min. TBTU (0.008 g, 0.025 mmol) was added. After 3 days the conversion to the ester (M/z: 772.5) was complete and the mixture was concentrated under reduced pressure. The residue was dissolved in formic acid (3 ml) and the solution was stirred at RT for 26 h. The mixture was concentrated under reduced pressure and the residue was dissolved in MeOH (4 ml) and TEA (1 ml). The solution was stirred at 40° C. for 6 h. The solvent was removed under reduced pressure. The residue was purified by preparative HPLC using a gradient of 20-50% MeCN in 0.1M ammonium acetate buffer as eluent. After freeze-drying, 0.005 g (52% yield) of the title compound was obtained as a white solid. M/z: 660.1. 1H NMR (DMSO, 400 MHz): δ 2.83-0.95 (m, 2H), 3.42-3.66 (m, 4), 3.91-4.01 (m, 1H), 4.25-4.31 (m, 1H), 4.32-4.39 (m, 1H), 4.54 (ABq, 2H), 4.68-4.76 (m, 1H), 5.02-5.06 (m, 1H), 5.68 (bs, 1H), 6.94-7.00 (m, 2H), 7.05-7.18 (m, 4H), 7.19-7.26 (m, 2H), 7.29-7.39 (m, 4H), 7.74-7.81 (m, 1H), 7.99 (d, 1H).

Provenance & Evidence