HCID 57786157, compound → HCID 57786321, compound

HRID 1399271Notes

Reaction equation

[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:15]4[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][C:16]=4[Cl:22])[CH2:12][CH2:13][CH2:14][N:7]3[C:6]=2[C:5]([CH:23]([CH2:26][CH3:27])[CH:24]=[O:25])=[CH:4][CH:3]=1.[CH3:28][Mg]Br>O1CCCC1.[Cl-].[NH4+]>[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:15]4[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][C:16]=4[Cl:22])[CH2:12][CH2:13][CH2:14][N:7]3[C:6]=2[C:5]([CH:23]([CH2:26][CH3:27])[CH:24]([OH:25])[CH3:28])=[CH:4][CH:3]=1

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 2-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]butanal (333 mg, 0.790 mmol) in tetrahydrofuran (8 mL) was added dropwise methylmagnesium bromide (3 M solution in diethyl ether, 0.395 mL, 1.19 mmol) at −78° C., and the mixture was stirred at −78° C. for 1 h. The reaction mixture was diluted with aqueous saturated ammonium chloride, and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 20-50% ethyl acetate/n-hexane gradient mixture to give the title compound as a colorless amorphous solid (192 mg, 0.437 mmol, 55%).

Workup

extractionextracted with ethyl acetate
washThe combined organic layer was washed with brine
dry with materialdried over anhydrous sodium sulfate
filtrationfiltered
concentrationconcentrated in vacuo
customThe residue was purified by flash column chromatography on silica gel eluting with a 20-50% ethyl acetate/n-hexane gradient mixture

Sources & evidence

ORD record: ord-527dcb5557de4f29a439373ab66889ca
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08901141B2

Reaction notes

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