Diisopropylethylamine → tert-butyl 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]oxyacetate

Participants

Reaction Steps

To a solution of (Z)-2-((2-(tert-butoxy)-2-oxoethoxy)imino)-2-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)acetic acid (108 mg, 0.269 mmol) in DCM (2.7 mL) at 0° C. was added DIPEA (141 μL, 0.808 mmol) followed by HATU (113 mg, 0.296 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 1 h of stirring it was diluted with 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 (106 mg, 72%). LCMS: R=0.78 min, m/z=551.2 (M+1) Method 2m_acidic.

Provenance & Evidence