Cesium carbonate → Tert-butyl (4-methoxybutyl)(3-methoxy-2-nitrophenyl)carbamate

HRID 1509462Notes

Reaction equation

[CH3:1][O:2][C:3]1[C:4]([N+:17]([O-:19])=[O:18])=[C:5]([NH:9][C:10](=[O:16])[O:11][C:12]([CH3:15])([CH3:14])[CH3:13])[CH:6]=[CH:7][CH:8]=1.CS(O[CH2:25][CH2:26][CH2:27][CH2:28][O:29][CH3:30])(=O)=O.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C)C=O>[CH3:30][O:29][CH2:28][CH2:27][CH2:26][CH2:25][N:9]([C:5]1[CH:6]=[CH:7][CH:8]=[C:3]([O:2][CH3:1])[C:4]=1[N+:17]([O-:19])=[O:18])[C:10](=[O:16])[O:11][C:12]([CH3:15])([CH3:13])[CH3:14]

Participants

Conditions

Temperature: 65 °C

Procedure

tert-Butyl (3-methoxy-2-nitrophenyl)carbamate (3.00 g) and 4-methoxybutyl methanesulfonate (3.06 g) were dissolved in dimethylformamide (40 ml), cesium carbonate (7.30 g) was added, and the mixture was stirred at 65° C. for 4 hr. The reaction mixture was concentrated under reduced pressure, diluted with water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel chromatography, and a fraction eluted with ethyl acetate-hexane (5:95-7:3) was concentrated under reduced pressure to give the object product (2.11 g).

Workup

concentrationThe reaction mixture was concentrated under reduced pressure
additiondiluted with water
extractionthe mixture was extracted with ethyl acetate
washThe extract was washed with saturated brine
dry with materialdried over anhydrous magnesium sulfate
concentrationconcentrated under reduced pressure
washa fraction eluted with ethyl acetate-hexane (5:95-7:3)
concentrationwas concentrated under reduced pressure

Sources & evidence

ORD record: ord-f32ca1fe2e1241e8b7d9b7f5d03a02a8
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09221836B2

Reaction notes

Loading…