Reaction Steps
A solution of (7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4] thiadiazin-3-yl)-acetic acid (prepared as described in Example 1j, 0.100 g, 0.300 mmol) and 2-phenylamino-cyclopentanecarboxylic acid ethyl ester (0.070 g, 0.300 mmol) in N,N-dimethylformamide (1.5 mL) was treated with N-methylmorpholine (72.8 mg, 0.72 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbo-diimide hydrochloride (69.0 mg, 0.36 mmol) and stirred at 25° C. for 4 h. The solvent was removed in vacuo. The crude material was redissolved in ethyl acetate (75 mL) and washed twice with 1.0 M aqueous hydrochloric acid solution (50 mL). The organic layer was then dried over sodium sulfate, filtered and concentrated in vacuo. The crude intermediate was redissolved in ethanol (5 mL) and treated with a 21% w/w solution of sodium ethoxide in ethanol (448 μL, 1.2 mmol) and stirred for 2 h at 60° C. The reaction was allowed to cool to 25° C., treated with glacial acetic acid (0.4 mL), the solvents were removed in vacuo, and the residue was and purified by prep-HPLC [Column Luna 5μ C18 (2) 100 Å AXIA 50×21.2 mm, 5 micron, 30%-90% in 7 min @ 30 mL/min flow rate, 0.05% trifluoroacetic acid in acetonitrile/0.05% trifluoroacetic acid in water] to afford the desired product, cis-N-[3-(4-Hydroxy-2-oxo-1-phenyl-2,4a,5,6,7,7a-hexahydro-1H-[1]pyrindin-3-yl)-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-7-yl]-methanesulfonamide (25 mg, 0.050 mmol, 16.6%), as a white solid. 1H NMR (400 MHz, CDCl3) δ: 1.65-1.72 (1H, m), 1.76-1.88 (2H, m), 1.93-2.00 (1H, m), 2.26-2.31 (2H, m), 3.04 (3H, s), 3.26 (1H, dd, J1=15.5 Hz, J2=7.7 Hz), 4.26 (1H, dd, J1=13.1 Hz, J2=5.4 Hz), 7.10 (1H, d, J=8.5 Hz), 7.22-7.29 (2H, m), 7.39 (1H, t, J=7.4 Hz), 7.49 (2H, t, J=8.0 Hz), 7.56-7.59 (1H, m), 7.69 (1H, d, J=2.5 Hz). LC-MS (ESI) calcd for C22H22N4O6S2 502.10, found 503.2 [M+H+].
