Diisopropylethylamine → tert-butyl 2-methyl-2-[(Z)-[1-[2-[(2-methylpropan-2-yl)oxycarbonylamino]-1,3-thiazol-4-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-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)acetic acid (81 mg, 0.19 mmol) in DCM (800 μL) at 0° C. was added DIPEA (88 μL, 0.504 mmol) followed by HATU (72 mg, 0.190 mmol). A few drops of DMF were added to homogenize the mixture. To the resulting solution was added a solution of (3S,4R)-4-((1H-1,2,4-triazol-1-yl)methyl)-3-aminoazetidin-2-one (21 mg, 0.126 mmol) in DCM (1 mL). After 1.5 h of stirring it was diluted with water/DCM and the layers separated. The aqueous layer was extracted with DCM and the combined organic layers were dried over Na2SO4 and concentrated in vacuo. The crude residue was purified via silica gel chromatography (Acetone-DCM) to afford the title compound (47 mg, 65%). LCMS: Rt=0.88 min, m/z=579.3 (M+1) Method 2m_acidic.

Provenance & Evidence