Sodium Azide → HCID 86637999, compound

HRID 881202Notes

Reaction equation

CS(O[CH2:6][CH2:7][NH:8][C:9]1[C:13]([C:14]2[N:18]([C:19]3[CH:24]=[CH:23][C:22]([F:25])=[C:21]([Br:26])[CH:20]=3)[C:17](=[O:27])[O:16][N:15]=2)=[N:12][O:11][N:10]=1)(=O)=O.[N-:28]=[N+:29]=[N-:30].[Na+]>CN(C)C=O>[N:28]([CH2:6][CH2:7][NH:8][C:9]1[C:13]([C:14]2[N:18]([C:19]3[CH:24]=[CH:23][C:22]([F:25])=[C:21]([Br:26])[CH:20]=3)[C:17](=[O:27])[O:16][N:15]=2)=[N:12][O:11][N:10]=1)=[N+:29]=[N-:30]

Participants

Conditions

Temperature: 50 °C

Procedure

To a solution of 2-({4-[4-(3-bromo-4-fluorophenyl)-5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl]-1,2,5-oxadiazol-3-yl}amino)ethyl methanesulfonate (2.13 kg, 4.6 mol, containing also some of the corresponding bromo-compound) in dimethylformamide (4 L) stirring in a 22 L flask was added sodium azide (380 g, 5.84 mol). The reaction was heated at 50° C. for 6 h, poured into ice/water (8 L), and extracted with 1:1 ethyl acetate:heptane (20 L). The organic layer was washed with water (5 L) and brine (5 L), and the solvents removed in vacuo to afford the desired product (1464 g, 77%) as a tan solid. LCMS for C12H8BrFN8O3Na (M+Na)+: m/z=433.0, 435.0. 1H NMR (DMSO-d6, 400 MHz): δ 8.08 (dd, J=6.2, 2.5 Hz, 1H), 7.72 (m, 1H), 7.58 (t, J=8.7 Hz, 1H), 6.75 (t, J=5.7 Hz, 1H), 3.54 (t, J=5.3 Hz, 2H), 3.45 (dd, J=11.1, 5.2 Hz, 2H).

Workup

extractionextracted with 1:1 ethyl acetate
washThe organic layer was washed with water (5 L) and brine (5 L)
customthe solvents removed in vacuo

Sources & evidence

ORD record: ord-782b90ce51444c8c8cdc168c5c0ff519
Source dataset: uspto-grants-2015_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08993605B2

Reaction notes

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