4-Methylmorpholine → N-{3-[(1R,2S,7R,8S)-3-(4-fluoro-3-methyl-benzyl)-6-hydroxy-4-oxo-3-aza-tricyclo[6.2.1.02,7]undec-5-en-5-yl]-1,1-dioxo-1,4-dihydro-1lambda6-benzo[1,2,4]thiadiazin-7-yl}-methanesulfonamide

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Reaction Conditions

Reaction Steps

Methyl (1S,2R,3S,4R)-3-(4-fluoro-3-methyl-benzylamino)-bicyclo[2.2.1]heptane-2-carboxylate (0.090 g, 0.31 mmol) was dissolved in anhydrous N,N-dimethylformamide (3 mL). (7-Methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetic acid (prepared as described in Example 1g, 0.10 g, 0.31 mmol) was added followed by N-methylmorpholine (0.071 mL, 0.65 mmol). The mixture was stirred until everything dissolved, approximately 5 min. 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.062 g, 0.32 mmol) was added and the mixture was stirred at 25° C. for 4 h. Triethylamine (0.13 mL, 0.92 mmol) was added and the mixture was stirred at 50° C. for 16 h. Upon cooling to 25° C., the solution was diluted with ethyl acetate (50 mL) and washed with 1.0 M aqueous hydrochloric acid solution (2×50 mL), saturated aqueous brine solution (20 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to afford a golden oil. Purification by flash column chromatography (Teledyne Isco RediSep column; 50 to 100% ethyl acetate in hexanes) afforded the desired product, N-{3-[(1R,2S,7R,8S)-3-(4-fluoro-3-methyl-benzyl)-6-hydroxy-4-oxo-3-aza-tricyclo[6.2.1.02,7]undec-5-en-5-yl]-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-7-yl}-methanesulfonamide (0.12 g, 0.21 mmol, 68%), as a white powder. 1H NMR (400 MHz, CDCl3) δ: 1.43-2.85 (9H, m), 2.29 (3H, s), 3.07 (3H, s), 3.45-3.47 (1H, m), 5.17-5.21 (2H, m), 6.95-7.05 (3H, m), 7.59-7.66 (3H, m). LC-MS (ESI) calcd for C26H27FN4O6S2 574.64, found 575.3 [M+H+].

Provenance & Evidence