Ethanol → HCID 136388468, compound

Temperature

25 °C

A suspension of (1R,2S,3R,4S)-3-ethoxycarbonyl-bicyclo[2.2.1]hept-2-yl-aminium (1′S)-(+)-10-camphorsulfonate (prepared as described in Example 6j, 5.00 g, 12.0 mmol) and potassium carbonate (4.16 g, 30.1 mmol) in ethyl acetate (80 mL) was stirred at 25° C. for 5 h, then was filtered through a medium frit. The filtrate was concentrated in vacuo to afford the crude (1S,2R,3S,4R)-3-amino-bicyclo[2.2.1]heptane-2-carboxylic acid ethyl ester (2.14 g). A portion of this material (1.00 g, 5.52 mmol) and (7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetic acid (prepared as described in Example 1g, 1.84 g, 5.52 mmol) were dissolved in N,N-dimethylformamide at 25° C. and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.11 g, 5.79 mmol) and N-methylmorpholine (1.27 mL, 11.6 mmol) were added sequentially. The resulting solution was stirred at 25° C. for 22 h, and then was concentrated in vacuo. The residue was partitioned between 1.0 M aqueous hydrochloric acid solution (200 mL) and ethyl acetate (2×150 mL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The resulting orange oil was dissolved in ethanol (70 mL) at 25° C. A 21 wt. % solution of sodium ethoxide in ethanol (10.7 mL, 33.0 mmol) was added and the reaction mixture was heated at 90° C. for 3 d. After cooling to 25° C., the reaction mixture was concentrated in vacuo to a volume of approximately 5 mL and was then partitioned between 1.0 M aqueous hydrochloric acid solution (200 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; 0 to 7% methanol in dichloromethane) to afford the desired product, (1R,2S,7R,8S)—N-[3-(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 (0.25 g, 0.552 mmol, 10%), as a white solid. 1H NMR (400 MHz, DMSO-d6) δ: 1.17-1.22 (2H, m), 1.39-1.58 (3H, m), 2.24 (1H, bs), 2.32 (1H, bs), 2.64-2.66 (1H, m), 2.84-2.87 (1H, m), 3.04 (3H, s), 3.54 (1H, bs), 3.63 (1H, bs), 7.49 (2H, bs), 7.55 (1H, bs), 8.11 (1H, bs), 9.52 (1H, bs), 10.12 (1H, bs). LC-MS (ESI) calcd for C18H20N4O6S2 452.08, found 453.2 [M+H+].

1. concentrationwas concentrated in vacuo
2. customThe residue was partitioned between 1.0 M aqueous hydrochloric acid solution (200 mL) and ethyl acetate (2×150 mL)
3. dry with materialThe organic layers were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. dissolutionThe resulting orange oil was dissolved in ethanol (70 mL) at 25° C
7. temperaturethe reaction mixture was heated at 90° C. for 3 d
8. temperatureAfter cooling to 25° C.
9. concentrationthe reaction mixture was concentrated in vacuo to a volume of approximately 5 mL
10. customwas then partitioned between 1.0 M aqueous hydrochloric acid solution (200 mL) and ethyl acetate (2×150 mL)
11. dry with materialThe organic layers were dried over sodium sulfate
12. filtrationfiltered
13. concentrationconcentrated in vacuo
14. customThe residue was purified by flash column chromatography (Teledyne Isco RediSep column; 0 to 7% methanol in dichloromethane)

ORD record

ord-6d4edccfa6984345a70a95ba997aa046

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08236948B2