Diisopropylethylamine → tert-butyl 2-methyl-2-[(Z)-[1-[5-[(2-methylpropan-2-yl)oxycarbonylamino]-1,2,4-thiadiazol-3-yl]-2-oxo-2-[[(3S,4R)-2-oxo-4-(1,2,4-triazol-1-ylmethyl)azetidin-3-yl]amino]ethylidene]amino]oxypropanoate

Participants

Reaction Steps

To a slurry of (Z)-2-(((1-(tert-butoxy)-2-methyl-1-oxopropan-2-yl)oxy)imino)-2-(5-((tert-butoxycarbonyl)amino)-1,2,4-thiadiazol-3-yl)acetic acid (129 mg, 0.299 mmol) in DCM:DMF (1:1, 3 mL) at 0° C. was added DIPEA (157 μL, 0.897 mmol) followed by HATU (136 mg, 0.359 mmol). To the resulting solution, after 20 min, was added a solution of (3S,4R)-4-((1H-1,2,4-triazol-1-yl)methyl)-3-aminoazetidin-2-one (50 mg, 0.299 mmol) in DCM. After 2 h of stirring it was concentrated in vacuo and taken up in EtOAc, washed with water, brine, dried over Na2SO4 and concentrated in vacuo. The crude residue was purified via silica gel chromatography (Acetone-DCM) to afford the title compound (100 mg, 58%). LCMS: Rt=0.82 min, m/z=580.2 (M+1) Method 2m_acidic.

Provenance & Evidence