Imidazole → 2-[(Tert-butyldimethylsilyl)oxy]-4-nitroaniline

HRID 1419349Notes

Reaction equation

[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][C:3]=1[OH:11].N1C=CN=C1.[Si:17](Cl)([C:20]([CH3:23])([CH3:22])[CH3:21])([CH3:19])[CH3:18]>CN(C=O)C>[Si:17]([O:11][C:3]1[CH:4]=[C:5]([N+:8]([O-:10])=[O:9])[CH:6]=[CH:7][C:2]=1[NH2:1])([C:20]([CH3:23])([CH3:22])[CH3:21])([CH3:19])[CH3:18]

Participants

Conditions

Temperature: 23 °C

Procedure

To a solution of 2-amino-5-nitrophenol (1 g, 6.49 mmol) and imidazole (0.88 g, 12.3 mmol) in DMF (15 mL), tert-butyldimethylsilyl chloride (11.2 mL, 64.9 mmol) was added. The resulting mixture was allowed to stir at 23° C. for 48 hours. The reaction mixture was partitioned between 0.1% HCl and ethyl acetate. The combined organic phase was washed with brine, dried over MgSO4 and filtered. Removal of solvent at reduced pressure and chromatography of the resulting oil on silica gel (hexane:ethyl acetate; 5:1) gave the titled compound (1.7 g, 98%). 1H NMR (CDCl3): δ 7.78 (dd, 1H, J=6.7 Hz and J=2.7 Hz), 7.61 (d, 1H, J=2.7 Hz), 6.7 (d, 1H, J=8.8 Hz), 1.0 (s, 9H), 0.28 (s, 6H).

Workup

customThe reaction mixture was partitioned between 0.1% HCl and ethyl acetate
washThe combined organic phase was washed with brine
dry with materialdried over MgSO4
filtrationfiltered
customRemoval of solvent at reduced pressure and chromatography of the resulting oil on silica gel (hexane:ethyl acetate; 5:1)

Sources & evidence

ORD record: ord-1274f5b15b214602b3088fd8c1bcbe30
Source dataset: uspto-grants-1999_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05886044

Reaction notes

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