Lithium Hydroxide → 4-[5-benzoyl-1,4-dimethyl-1H-pyrrol-2-ylmethyl]nitrobenzene

HRID 618317Notes

Reaction equation

[C:1]([C:9]1[N:13]([CH3:14])[C:12]([CH:15]([C:21]2[CH:26]=[CH:25][C:24]([N+:27]([O-:29])=[O:28])=[CH:23][CH:22]=2)C(OCC)=O)=[CH:11][C:10]=1[CH3:30])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Li+].[OH-]>CO>[C:1]([C:9]1[N:13]([CH3:14])[C:12]([CH2:15][C:21]2[CH:22]=[CH:23][C:24]([N+:27]([O-:29])=[O:28])=[CH:25][CH:26]=2)=[CH:11][C:10]=1[CH3:30])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 60 °C

Procedure

Ethyl 2-(5-benzoyl-1,4-dimethylpyrrol-2-yl)-2-(4-nitrophenyl)acetate (8.2 g, 20.2 mmol) [prepared by proceeding as described in Example 1, Steps (a) and (b) ] was dissolved in a 1:1 mixture of methanol (200 ml). An aqueous solution of LiOH (250 mi 0.4 M, 100.9 mmol) was added and the mixture was stirred at 60° C. for 2 h. The organic solvents were evaporated in vacuo, the aqueous residue was acidified with 10% HCl, and the product was extracted into ethyl acetate. The organic phase was washed with water, dried over sodium sulfate, and concentrated under vacuum. Purification on a Florisil® column (hexane-ethyl acetate, 4:1) gave 4-[5-benzoyl-1,4dimethyl-1H-pyrrol-2-ylmethyl]-nitrobenzene (6.68 g, 99%) as a yellow solid. ##STR23##

Workup

customThe organic solvents were evaporated in vacuo
extractionthe product was extracted into ethyl acetate
washThe organic phase was washed with water
dry with materialdried over sodium sulfate
concentrationconcentrated under vacuum
customPurification on a Florisil® column (hexane-ethyl acetate, 4:1)

Sources & evidence

ORD record: ord-9fa6e69fadf34302b5152b2062294512
Source dataset: uspto-grants-1999_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05952368

Reaction notes

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