(1S,2S,3R,4R)-3-(2-Amino-5-chloro-3-nitro-pyridin-4-ylamino)-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid amide → (1S,2S,3R,4R)-3-(2,3-Diamino-5-chloro-pyridin-4-ylamino)-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid amide

Temperature

30 °C

(1S,2S,3R,4R)-3-(2-Amino-5-chloro-3-nitro-pyridin-4-ylamino)-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid amide (100 mg, 0.3 mmol) was dissolved in a mixture of tetrahydrofuran (1 mL) and acetic acid (1.6 mL). Powdered iron (121 mg, 2.162 mmol) was added and the mixture was stirred at 30° C. for four hours. Two drops of water was added and suspended solids were removed by filtration. The solid was washed with ethyl acetate (5 mL) and the combined filtrates were portioned between ethyl acetate and saturated sodium bicarbonate solution. The organics were extracted with ethyl acetate (3×25 mL), were dried (sodium sulfate) and were concentrated. Purification was effected via ISCO chromatography (12 g silica cartridge: gradient elution—0 to 15% MeOH:DCM) to afford 77 mg (80%) of the title compound as a tan solid. 1H NMR (d-chloroform): 7.49 (s, 1H), 6.18-6.20 (m, 4H), 6.09 (m, 1H), 4.51 (d, J=11 Hz, 1H), 4.09 (br s, 2H), 3.79 (d, J=9 Hz, 1H), 2.97 (s, 1H), 2.64 (s, 1H), 2.53 (d, J=8 Hz, 1H), 2.32 (d, J=9 Hz, 1H), 2.06 (s, 1H), 1.66 (d, J=9 Hz, 1H). MS: 294.99 (M+H). HPLC retention time: 1.62 minutes (G Method).

1. customwere removed by filtration
2. washThe solid was washed with ethyl acetate (5 mL)
3. extractionThe organics were extracted with ethyl acetate (3×25 mL)
4. dry with materialwere dried (sodium sulfate)
5. concentrationwere concentrated
6. customPurification
7. washwas effected via ISCO chromatography (12 g silica cartridge: gradient elution—0 to 15% MeOH:DCM)

ORD record

ord-38f81964e9964af1a39616eb6746318f

Source dataset

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09238656B2