Ethanol → (1R,2S,7R,8S)-N-[3-(6-hydroxy-3-isobutyl-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

Temperature

25 °C

(7-Methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetic acid (prepared as described in Example 1g, 0.317 g, 0.951 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.192 g, 1.00 mmol) and N-methylmorpholine (0.220 mL, 2.00 mmol) were added sequentially to a solution of crude (1S,2R,3S,4R)-3-isobutylamino-bicyclo[2.2.1]heptane-2-carboxylic acid ethyl ester (0.228 g, 0.952 mmol) in N,N-dimethylformamide (4 mL) at 25° C. The reaction mixture was stirred at 25° C. for 2 h, and then was partitioned between 1.0 M aqueous hydrochloric acid solution (100 mL) and ethyl acetate (2×100 mL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The residue was dissolved in ethanol (15 mL) at 25° C. A 21 wt. % solution of sodium ethoxide in ethanol (1.23 mL, 3.80 mmol) was added and the reaction mixture was heated at 60° C. for 1.5 h. After cooling to 25° C., the reaction mixture was partitioned between 1.0 M aqueous hydrochloric acid solution (150 mL) and ethyl acetate (2×150 mL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography (Teledyne Isco RediSep column; 40 to 100% ethyl acetate in hexanes) to afford the desired product, (1R,2S,7R,8S)—N-[3-(6-hydroxy-3-isobutyl-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 (0.096 g, 0.190 mmol, 20%), as a white solid. 1H NMR (400 MHz, DMSO-d6) δ: 0.83 (3H, d, J=7.2 Hz), 0.93 (3H, d, J=7.1 Hz), 1.19-1.21 (1H, m), 1.28-1.32 (1H, m), 1.43-1.63 (3H, m), 2.09-2.15 (1H, m), 2.54 (1H, bs), 2.61-2.61 (1H, m), 2.74-2.79 (1H, m), 3.05 (3H, s), 3.30 (1H, bs), 3.60 (1H, d, J=9.2 Hz), 3.73-3.79 (1H, m), 7.49-7.52 (1H, m), 7.56-7.58 (2H, m), 10.17 (1H, s). LC-MS (ESI) calcd for C22H28N4O6S2 508.15, found 509.4 [M+H+].

1. customwas partitioned between 1.0 M aqueous hydrochloric acid solution (100 mL) and ethyl acetate (2×100 mL)
2. dry with materialThe organic layers were dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. dissolutionThe residue was dissolved in ethanol (15 mL) at 25° C
6. temperaturethe reaction mixture was heated at 60° C. for 1.5 h
7. temperatureAfter cooling to 25° C.
8. customthe reaction mixture was partitioned between 1.0 M aqueous hydrochloric acid solution (150 mL) and ethyl acetate (2×150 mL)
9. dry with materialThe organic layers were dried over sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated in vacuo
12. customThe residue was purified by flash column chromatography (Teledyne Isco RediSep column; 40 to 100% ethyl acetate in hexanes)

ORD record

ord-ca9621421e6c48d490ef4b159ecce33c

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08236948B2