Water → Ethyl 5-amino-2-(pyridin-3-yl)thiazole-4-carboxylate

HRID 2199218Notes

Reaction equation

Br[C:2]1[S:6][C:5]([C:7]2[CH:8]=[N:9][CH:10]=[CH:11][CH:12]=2)=[N:4][C:3]=1[C:13]([O:15][CH2:16][CH3:17])=[O:14].O.[N-:19]=[N+]=[N-].[Na+]>CN(C=O)C>[NH2:19][C:2]1[S:6][C:5]([C:7]2[CH:8]=[N:9][CH:10]=[CH:11][CH:12]=2)=[N:4][C:3]=1[C:13]([O:15][CH2:16][CH3:17])=[O:14]

Participants

Conditions

Temperature: 75 °C

Procedure

To a round bottom flask containing ethyl 5-bromo-2-(pyridin-3-yl)thiazole-4-carboxylate (2.5 g, 7.98 mmol) in DMF (26.6 ml)/water (13.3 ml) was carefully added sodium azide (2.59 g, 39.9 mmol) and stirred overnight at 75° C. The reaction was cooled to room temperature and poured into water which was extracted with ethyl acetate. The ethyl acetate layers were combined and washed with hexanes/water. The ethyl acetate extracts were dried (MgSO4), filtered and concentrated to dryness. The crude material was purified by silica gel column chromatography (0 to 75% ethylacetate/hexanes) to give the desired product as a white solid (0.6 g, 30%) 1H NMR (300 MHz, CDCl3) δ 8.98 (s, 1H), 8.63 (d, 1H), 8.19 (d, 1H), 7.45-7.32 (m, 1H), 6.3 (s, 2H), 4.46 (q, 2H), 1.43 (t, 3H). ESIMS m/z 251.1 (M+2).

Workup

temperatureThe reaction was cooled to room temperature
extractionwas extracted with ethyl acetate
washwashed with hexanes/water
dry with materialThe ethyl acetate extracts were dried (MgSO4)
filtrationfiltered
concentrationconcentrated to dryness
customThe crude material was purified by silica gel column chromatography (0 to 75% ethylacetate/hexanes)

Sources & evidence

ORD record: ord-92c0b4199aa74294b112ac2daaff31f2
Source dataset: uspto-grants-2016_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09357780B2

Reaction notes

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