Triethylamine → (3R,4S)-1-[4-(3-aminoprop-1-yn-1-yl)phenyl]-4-(4-{[tert-butyl(dimethyl)silyl]oxy}phenyl)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]azetidin-2-one

Participants

Reaction Steps

To a solution of 8 mg (0.013 mmol, 1 equiv.) (3R,4S)-4-(4-{[tert-butyl(dimethyl)silyl]oxy}phenyl)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-1-(4-iodophenyl)azetidin-2-one (intermediate step A) in 0.5 mL DMF was added 2.2 mg (0.002 mmol, 0.15 equiv.) tetrakistriphenylphosphine palladium(0) and 0.8 mg (0.004 mmol, 0.3 equiv) copper(I) iodide. The solution was deoxygenated by a slow stream of anhydrous nitrogen delivered by a needle through a rubber septum. To the resulting solution was added by syringe 0.012 mL (0.177 mmol, 14 equiv.) propargyl amine and 0.012 mL (0.09 mmol, 7 equiv.) triethylamine. The resulting solution was stirred at room temperature for 1.25 hr at which time the solvent was removed under vacuum. The residue was purified by prep. Tlc eluting with CH2Cl2/MeOH (9/1) to afford the title compound. m/z (ES) 559.3 (MH+), 542.3 (MH−NH3+).

Provenance & Evidence