Hydrochloric Acid → 7-[[5-[(4-Acetyl-3-hydroxy-2-propylbenzyl)thio]-1,3,4-thiadiazol-2-yl]thio]heptanoic acid

HRID 1646508Notes

Reaction equation

[C:1]([C:4]1[CH:17]=[CH:16][C:7]([CH2:8][S:9][C:10]2[S:11][C:12]([SH:15])=[N:13][N:14]=2)=[C:6]([CH2:18][CH2:19][CH3:20])[C:5]=1[OH:21])(=[O:3])[CH3:2].Br[CH2:23][CH2:24][CH2:25][CH2:26][CH2:27][CH2:28][C:29]([OH:31])=[O:30].C(=O)([O-])[O-].[K+].[K+].[OH-].[Na+].Cl>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.C(OCC)(=O)C.C(C(C)=O)C>[C:1]([C:4]1[CH:17]=[CH:16][C:7]([CH2:8][S:9][C:10]2[S:11][C:12]([S:15][CH2:23][CH2:24][CH2:25][CH2:26][CH2:27][CH2:28][C:29]([OH:31])=[O:30])=[N:13][N:14]=2)=[C:6]([CH2:18][CH2:19][CH3:20])[C:5]=1[OH:21])(=[O:3])[CH3:2]

Participants

Conditions

Temperature: 60 °C

Procedure

To a mixture of 0.20 g of 2-[(4-acetyl-3-hydroxy-2-propylbenzyl)thio]-5-mercapto-1,3,4-thiadiazole obtained in Example 8, 0.15 g of 7-bromoheptanoic acid, 0.18 g of anhydrous potassium carbonate and 5 ml of methyl ethyl ketone was added a catalytic amount of tetra-n-butylammonium bromide. The mixture was stirred at 60° C. for 1 hour. An aqueous sodium hydroxide solution and ethyl acetate were added to the reaction solution to perform fractionation. The aqueous phase was made acidic with 2N hydrochloric acid and extracted with ethyl acetate. After the extract was dried over anhydrous magnesium sulfate, the solvent was distilled off. The residue was applied to silica gel column chromatography. Elution with a mixture of hexane-ethyl acetate (2:1) gave 0.20 g of 7-[[5-[(4-acetyl-3-hydroxy-2-propylbenzyl)thio]-1,3,4-thiadiazol-2-yl]thio]heptanoic acid.

Workup

extractionextracted with ethyl acetate
dry with materialAfter the extract was dried over anhydrous magnesium sulfate
distillationthe solvent was distilled off
washElution
additionwith a mixture of hexane-ethyl acetate (2:1)

Sources & evidence

ORD record: ord-77b57bed6cef4c7491bbb68c9caf6bb1
Source dataset: uspto-grants-1993_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05180730

Reaction notes

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