4-Methylmorpholine → N-({4-[(2R,3R)-3-{[(2R)-2-{[tert-butyl(dimethyl)silyl]oxy}-2-(4-fluorophenyl)ethyl]thio}-1-(4-{3-[(methylsulfonyl)amino]prop-1-yn-1-yl}phenyl)-4-oxoazetidin-2-yl]phenoxy}acetyl)glycyl-N6-(tert-butoxycarbonyl)-D-lysine

Participants

Reaction Conditions

Reaction Steps

{4-[(2R,3R)-3-{[(2R)-2-{[tert-butyl(dimethyl)silyl]oxy}-2-(4-fluorophenyl)ethyl]thio}-1-(4-{3-[(methylsulfonyl)amino]prop-1-yn-1-yl}phenyl)-4-oxoazetidin-2-yl]phenoxy}acetic acid (Method 8) (15.1 mg, 0.021 mmol) was dissolved in DMF (1 ml, dry). N-methylmorpholine (7 μl, 0.064 mmol) was added and the reaction mixture was stirred at 30° C. for five minutes. TBTU (10.8 mg, 0.034 mmol) was added and the reaction mixture was stirred at the same conditions for 1 hour. Glycyl-N6-(tert-butoxycarbonyl)-D-lysine (10.0 mg 0.033 mmol) was added and the reaction mixture was stirred for 2 hours. The mixture was purified with preparative HPLC on a C8 column. A gradient from 10 to 100% MeCN in a 0.1M NH4OAc buffer was used as eluent. The pure fractions were collected and most of the MeCN was removed under reduced pressure. The residue was lyophilised to give the title compound. M/z: 996.74 (M−1).

Provenance & Evidence