Water → HCID 59139370, compound

HRID 599852Notes

Reaction equation

[Li+].C[Si]([N-][Si](C)(C)C)(C)C.[Cl:11][C:12]1[C:13]([O:34][C:35](=[O:39])[N:36]([CH3:38])[CH3:37])=[CH:14][C:15]2[O:20][C:19](=[O:21])[C:18]([CH2:22][C:23]3[CH:28]=[CH:27][CH:26]=[C:25]([N+:29]([O-:31])=[O:30])[CH:24]=3)=[C:17]([CH3:32])[C:16]=2[CH:33]=1.[C:40](Cl)(=[O:42])[CH3:41].O>C1COCC1>[Cl:11][C:12]1[C:13]([O:34][C:35](=[O:39])[N:36]([CH3:37])[CH3:38])=[CH:14][C:15]2[O:20][C:19](=[O:21])[C:18]([CH2:22][C:23]3[CH:28]=[CH:27][CH:26]=[C:25]([N+:29]([O-:31])=[O:30])[CH:24]=3)=[C:17]([CH2:32][C:40](=[O:42])[CH3:41])[C:16]=2[CH:33]=1

Participants

Conditions

Temperature: 0 °C

Procedure

LiHMDS (11.5 mL, 1.0 M in THF) was added under nitrogen atmosphere at −78° C. to a suspension of dimethylcarbamic acid 6-chloro-4-methyl-3-(3-nitrobenzyl)-2-oxo-2H-1-benzopyran-7-yl ester (compound 1g-1-3) (4.0 g, 9.60 mmol) in anhydrous THF (100 mL), and the mixture was stirred at −78° C. for 30 minutes and at 0° C. for 30 minutes. Acetyl chloride (1.36 mL, 19.2 mmol) was then added thereto, and the mixture was stirred at room temperature for 1 hour. The reaction mixture was then poured into water and extracted with ethyl acetate. The organic extract was washed with saturated saline and dried over magnesium sulfate. A crude solid was obtained by vacuum concentration, and purified by column chromatography (ethyl acetate:hexane=1:3) to yield the title compound (1.28 g, 29%) as a white powder.

Workup

stirringthe mixture was stirred at room temperature for 1 hour
extractionextracted with ethyl acetate
extractionThe organic extract
washwas washed with saturated saline
dry with materialdried over magnesium sulfate
customA crude solid was obtained by vacuum concentration
custompurified by column chromatography (ethyl acetate:hexane=1:3)

Sources & evidence

ORD record: ord-2cdc310c41614ad3bd9b98edb0f9a708
Source dataset: uspto-grants-2011_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07897792B2

Reaction notes

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