Tributylphosphine → 4-((5-Chloro-3-thienyl)methoxy)-1-(2-ethyl-1-methyl-1H-benzimidazol-6-yl)pyridin-2(1H)-one

HRID 2203054Notes

Reaction equation

[CH2:1]([C:3]1[N:7]([CH3:8])[C:6]2[CH:9]=[C:10]([N:13]3[CH:18]=[CH:17][C:16]([OH:19])=[CH:15][C:14]3=[O:20])[CH:11]=[CH:12][C:5]=2[N:4]=1)[CH3:2].[Cl:21][C:22]1[S:26][CH:25]=[C:24]([CH2:27]O)[CH:23]=1.C(P(CCCC)CCCC)CCC.N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O>C1COCC1.O>[Cl:21][C:22]1[S:26][CH:25]=[C:24]([CH2:27][O:19][C:16]2[CH:17]=[CH:18][N:13]([C:10]3[CH:11]=[CH:12][C:5]4[N:4]=[C:3]([CH2:1][CH3:2])[N:7]([CH3:8])[C:6]=4[CH:9]=3)[C:14](=[O:20])[CH:15]=2)[CH:23]=1

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of 1-(2-ethyl-1-methyl-1H-benzimidazol-6-yl)-4-hydroxypyridin-2(1H)-one (2.5 g), (5-chloro-3-thienyl)methanol (2.48 g) and tributylphosphine (5.63 g) in THF (150 ml) was added 1,1′-(azodicarbonyl)dipiperidine (7.03 g), and the reaction mixture was stirred at 60° C. for 2 h. The reaction mixture was cooled to room temperature. The mixture was poured into water and extracted with EtOAc. The extract was washed With brine, dried over MgSO4, concentrated and purified by NH silica gel column chromatography (hexane/EtOAc then ETOAc/MeOH). The resulting solid was recrystallized from EtOH-hexane to give the title compound (1.15 g) as a white solid.

Workup

temperatureThe reaction mixture was cooled to room temperature
extractionextracted with EtOAc
washThe extract was washed With brine
dry with materialdried over MgSO4
concentrationconcentrated
custompurified by NH silica gel column chromatography (hexane/EtOAc
customThe resulting solid was recrystallized from EtOH-hexane

Sources & evidence

ORD record: ord-481b54a83b6948eda238d3d169434d60
Source dataset: uspto-grants-2016_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09365540B2

Reaction notes

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