Trifluoroacetic acid → HCID 140652229, compound

Participants

Reaction Steps

To a solution of 1-(((6R,7R)-7-((Z)-2-(((1-(tert-butoxy)-2-methyl-1-oxopropan-2-yl)oxy)imino)-2-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)acetamido)-2-(((4-methoxybenzyl)oxy)carbonyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl)methyl)-1-((5-chloro-1-ethyl-6,7-bis((4-methoxybenzyl)oxy)-4-oxo-1,4-dihydroquinolin-3-yl)methyl)pyrrolidin-1-ium (2.668 g, 80% purity, 1.632 mmol) in Dichloromethane (DCM) (15 mL) under N2 at 0° C. was added anisole (1.783 mL, 16.32 mmol), followed by TFA (5.0 mL, 64.9 mmol). The mixture was warmed up to rt and stirred at rt over night. LCMS indicated completion of the deprotection. The mixture was cooled to 0° C. Diisopropyl ether (50 mL) was then added. The mixture was stirred for 10 min and the solid was collected by filtration, and washed twice with diisopropyl ether (2×10 mL). The solid (˜2.0 g) was dissolved in a mixture of CH3CN (10 mL)/water (10 mL)/2M HCl (2.5 mL), HP20SS resin (12 g) was then added. The mixture was concentrated to dryness, and the resin was loaded in a pre-column containing HP20SS resin (15 g), and was then purified by reverse phase Combiflash using C18 column and eluting with 0-30% CH3CN/water to afford (6R,7R)-7-((Z)-2-(2-aminothiazol-4-yl)-2-(((2-carboxypropan-2-yl)oxy)imino)acetamido)-3-((1-((5-chloro-1-ethyl-6,7-dihydroxy-4-oxo-1,4-dihydroquinolin-3-yl)methyl)pyrrolidin-1-ium-1-yl)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate (0.66 g, 0.793 mmol, 48.6% yield) as a slightly brown solid. LCMS: (M+H)+: 790.1. 1H NMR (400 MHz, METHANOL-d4) δ ppm 1.50 (s, 3 H) 1.62 (d, J=6.57 Hz, 6 H) 2.12-2.28 (m, 4 H) 3.42-3.63 (m, 6 H) 3.95-4.05 (m, 1 H) 4.07-4.16 (m, 1 H) 4.26-4.40 (m, 3 H) 4.47-4.55 (m, 1 H) 5.30-5.37 (m, 1 H) 5.89-5.97 (m, 1 H) 6.91 (s, 1 H) 7.04-7.10 (m, 1 H) 8.17-8.24 (m, 1 H).

Provenance & Evidence