Trifluoroacetic acid → 1-[(Z)-[2-[[(2R,3S)-2-[[4-(aminomethyl)triazol-2-yl]methyl]-4-oxo-1-sulfoazetidin-3-yl]amino]-1-(2-amino-1,3-thiazol-4-yl)-2-oxoethylidene]amino]oxycyclopropane-1-carboxylic acid

Participants

Reaction Steps

Followed the general procedure for the acid mediated deprotection using (2R,3S)-3-((Z)-2-((1-((benzhydryloxy)carbonyl)cyclopropoxy)imino)-2-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)acetamido)-2-((4-(((tert-butoxycarbonyl)amino)methyl)-2H-1,2,3-triazol-2-yl)methyl)-4-oxoazetidine-1-sulfonic acid (1.98 g, 2.21 mmol), DCM (18.4 mL) and TFA (10.2 mL, 133 mmol). Half of the crude residue purified by reverse phase prep HPLC (XSelect CSH, 30×100 mm, 5 μm, C18 column; ACN-water with 0.1% formic acid modifier, 60 mL/min), affording the title compound (300 mg, ca 50%) as an off-white powder. LCMS: Rt=0.29 min, m/z=530.1 (M+1) Method 2m_acidic; 1H NMR (400 MHz, D2O) δ 7.69 (s, 1H), 7.04 (br s, 1H), 5.43 (d, J=5.5 Hz, 1H), 4.93-4.78 (m, 2H), 4.74-4.67 (m, 1H), 4.22-4.12 (m, 2H), 1.36-1.20 (m, 2H), 1.20-1.00 (m, 2H).

Provenance & Evidence