Ethyl(methoxy)amine hydrochloride → 2-tert-Butyl-6-chloro-benzooxazole-7-sulfonic acid ethyl-methoxy-amide

HRID 1669614Notes

Reaction equation

Cl.[CH2:2]([NH:4][O:5][CH3:6])[CH3:3].[C:7]([C:11]1[O:12][C:13]2[C:19]([S:20](Cl)(=[O:22])=[O:21])=[C:18]([Cl:24])[CH:17]=[CH:16][C:14]=2[N:15]=1)([CH3:10])([CH3:9])[CH3:8]>C1COCC1.CCOC(C)=O>[CH2:2]([N:4]([O:5][CH3:6])[S:20]([C:19]1[C:13]2[O:12][C:11]([C:7]([CH3:9])([CH3:8])[CH3:10])=[N:15][C:14]=2[CH:16]=[CH:17][C:18]=1[Cl:24])(=[O:21])=[O:22])[CH3:3]

Participants

Conditions

Temperature: 0 °C

Procedure

N-Ethyl-O-methylhydroxylamine hydrochloride (Intermediate G) (3.39 g, 30.4 mmol) was suspended in dry THF (20 ml) and cooled to 0° C. in an ice bath while stirring. TEA (4.24 ml, 30.4 mmol) was added followed by dropwise addition of 2-tert-butyl-6-chloro-benzooxazole-7-sulfonyl chloride (US 2007/0249672 page 9) (4.68 g, 15.19 mmol) in THF (10 ml) over 2.5 hours. The reaction mixture was stirred at room temperature for 30 minutes. The reaction mixture was diluted with EtOAc and washed with H2O, brine, dried (MgSO4) and concentrated in vacuo. The residue was purified by flash chromatography, eluting with 0-10% EtOAc in iso-hexane, to yield a white solid [M+H]+ 347.2

Workup

stirringThe reaction mixture was stirred at room temperature for 30 minutes
washwashed with H2O, brine
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo
customThe residue was purified by flash chromatography
washeluting with 0-10% EtOAc in iso-hexane
customto yield a white solid [M+H]+ 347.2

Sources & evidence

ORD record: ord-209cf9fac31143a1b7a8edec201118e4
Source dataset: uspto-grants-2011_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07989497B2

Reaction notes

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