Sodium Hydroxide → 5-n-Butyl-4-(4-carboxybenzyl)-2,4-dihydro-2-[2-(trifluoromethyl)phenyl]-3H-1,2,4-triazol-3-one

HRID 36240Notes

Reaction equation

[CH2:1]([C:5]1[N:6]([CH2:21][C:22]2[CH:27]=[CH:26][C:25]([C:28]([O:30]C)=[O:29])=[CH:24][CH:23]=2)[C:7](=[O:20])[N:8]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[C:16]([F:19])([F:18])[F:17])[N:9]=1)[CH2:2][CH2:3][CH3:4].[OH-].[Na+]>C1COCC1.CO>[CH2:1]([C:5]1[N:6]([CH2:21][C:22]2[CH:23]=[CH:24][C:25]([C:28]([OH:30])=[O:29])=[CH:26][CH:27]=2)[C:7](=[O:20])[N:8]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[C:16]([F:19])([F:17])[F:18])[N:9]=1)[CH2:2][CH2:3][CH3:4]

Participants

Conditions

Temperature: 60 °C

Procedure

A solution of 25 mg (0.0577 mmole) of 5-n-butyl-2,4-dihydro-4-[4-(methoxycarbonyl)benzyl]-2-[2-(trifluoromethyl)phenyl]-3H-1,2,4-triazol-3-one (from Example 26) in 0.25 mL of THF was treated with 0.25 mL of 1N sodium hydroxide in methanol, and the resulting solution was stirred overnight at 60° C. Volatiles were removed by evaporation, and the residue was taken up in 1 mL of methanol and acidified to pH 1.5 by addition of 1N HCl in methanol. The mixture was concentrated to dryness. The residue was leached with chloroform. The CHCl3 solution was dried over anhydrous sodium sulfate, filtered through Celite, and concentrated in vacuo to give 23 mg (96%) of the title compound as a colorless, glassy solid; homogeneous by TLC in 9:1 CH2Cl2 --MeOH; mass spectrum (FAB) m/e 420 (M+1)+.

Workup

customVolatiles were removed by evaporation
additionacidified to pH 1.5 by addition of 1N HCl in methanol
concentrationThe mixture was concentrated to dryness
dry with materialThe CHCl3 solution was dried over anhydrous sodium sulfate
filtrationfiltered through Celite
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-ec6e9dc321a442e3abca84b4aab65d41
Source dataset: uspto-grants-1995_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05411980

Reaction notes

Loading…