Potassium Cyanide → 2-(4-(Trifluoromethyl)benzyl)-7-(4-chlorophenyl)-3-oxo-2,3-dihydro-[1,2,4]triazolo[4,3-b]pyridazine-8-carbonitrile

HRID 2224288Notes

Reaction equation

[F:1][C:2]([F:29])([F:28])[C:3]1[CH:27]=[CH:26][C:6]([CH2:7][N:8]2[C:24](=[O:25])[N:11]3[N:12]=[CH:13][C:14]([C:17]4[CH:22]=[CH:21][C:20]([Cl:23])=[CH:19][CH:18]=4)=[C:15](Cl)[C:10]3=[N:9]2)=[CH:5][CH:4]=1.[C-:30]#[N:31].[K+]>CN1CCCC1=O>[F:29][C:2]([F:28])([F:1])[C:3]1[CH:27]=[CH:26][C:6]([CH2:7][N:8]2[C:24](=[O:25])[N:11]3[N:12]=[CH:13][C:14]([C:17]4[CH:18]=[CH:19][C:20]([Cl:23])=[CH:21][CH:22]=4)=[C:15]([C:30]#[N:31])[C:10]3=[N:9]2)=[CH:5][CH:4]=1

Participants

Conditions

Temperature: 120 °C

Procedure

A suspension of 2-(4-(trifluoromethyl)benzyl)-8-chloro-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (43.8 mg, 0.10 mmol), prepared as described in example 361G, and KCN (33 mg, 0.5 mmol) in dry 1-methyl-2-pyrrolidinone (1 mL) was heated at 120° C. for 2 h under argon. HPLC/MS analysis indicated complete reaction. The reaction mixture was concentrated under vacuum with co-evaporation of toluene (5 mL×2) to obtain a yellow solid. The crude product was purified by reversed phase preparative HPLC (C-18, MeOH/H2O gradient, 0.1% TFA) to obtain title compound (31 mg, 72%), 2-(4-(trifluoromethyl)benzyl)-7-(4-chlorophenyl)-3-oxo-2,3-dihydro-[1,2,4]triazolo[4,3-b]pyridazine-8-carbonitrile as a yellow solid. MS [M+H]+ 430; HPLC retention time=3.76 min.

Workup

customprepared
customreaction
concentrationThe reaction mixture was concentrated under vacuum with co-evaporation of toluene (5 mL×2)
customto obtain a yellow solid
customThe crude product was purified by reversed phase preparative HPLC (C-18, MeOH/H2O gradient, 0.1% TFA)

Sources & evidence

ORD record: ord-b1813966ac3840bcb1cbe443b9852344
Source dataset: uspto-grants-2008_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07378418B2

Reaction notes

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