Hydrochloric Acid → 4-(2,6-Diethyl-4-methylphenyl)-2,6-dimethyl-5-methylsulfonyl-2,3-dihydro-3-pyridazinone

HRID 335459Notes

Reaction equation

[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12](=O)[C:13]([N:15]([CH3:24])[N:16]=[C:17]([CH3:23])[CH2:18][S:19]([CH3:22])(=[O:21])=[O:20])=[O:14])[CH3:2].C1(C)C=CC=CC=1.O.[OH-].[Li+].Cl>CO>[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12]1[C:13](=[O:14])[N:15]([CH3:24])[N:16]=[C:17]([CH3:23])[C:18]=1[S:19]([CH3:22])(=[O:21])=[O:20])[CH3:2]

Participants

Conditions

Temperature: 0 °C

Procedure

To a 25 mL volume three-necked flask, 1-[2-(2,6-diethyl-4-methylphenyl)-2-oxoacetyl]-1-methyl-2-(1-methylsulfonyl-2-propylidene)hydrazine ((4-34)-(1)-39) (1.95 g), toluene (4.85 ml), and methanol (1.05 ml) were added under a nitrogen atmosphere, then added lithium hydroxide monohydrate (169 mg) at 0° C. After the mixture was stirred at 0° C. for 4 hours, 10 w/w % of hydrochloric acid was added to adjust to pH to less than 1, and extracted with toluene 3 times. The organic layers were combined and concentrated under reduced pressure. The residue was subjected to column chromatography (hexane:ethyl acetate=3:1) to give 1.077 g of 4-(2,6-diethyl-4-methylphenyl)-2,6-dimethyl-5-methylsulfonyl-2,3-dihydro-3-pyridazinone ((2-34)-(1)-39).

Workup

customat 0° C
extractionextracted with toluene 3 times
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-44ddc0bb8f77452483c93770d93ebcd9
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08884010B2

Reaction notes

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