Lithium Hexamethyldisilazide → HCID 57489620, compound

HRID 2044068Notes

Reaction equation

Cl[C:2]1[N:10]=[C:9]([Cl:11])[CH:8]=[CH:7][C:3]=1[C:4]([NH2:6])=[O:5].[NH2:12][C:13]1[CH:18]=[CH:17][C:16]([N:19]2[CH2:24][CH2:23][N:22]([C:25]([O:27][CH2:28][C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=3)=[O:26])[CH2:21][CH2:20]2)=[CH:15][CH:14]=1.C[Si]([N-][Si](C)(C)C)(C)C.[Li+]>C1COCC1>[C:4]([C:3]1[C:2]([NH:12][C:13]2[CH:14]=[CH:15][C:16]([N:19]3[CH2:20][CH2:21][N:22]([C:25]([O:27][CH2:28][C:29]4[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=4)=[O:26])[CH2:23][CH2:24]3)=[CH:17][CH:18]=2)=[N:10][C:9]([Cl:11])=[CH:8][CH:7]=1)(=[O:5])[NH2:6]

Participants

Conditions

Temperature: -78 °C

Procedure

To a mixture of 2,6-dichloronicotinamide (3 g, 15.71 mmol) and benzyl 4-(4-aminophenyl)piperazine-1-carboxylate (5.38 g, 17.28 mmol) in THF (100 mL) was added lithium bis(trimethylsilyl)amide (55.0 mL, 55.0 mmol) at −78° C. The reaction mixture was stirred at −78° C. for 20 min. and at rt for 2 h. The reaction was quenched with water and extracted three times with ethyl acetate. The combined organic layers were washed with water and concentrated. The residue was purified by MPLC chromatography (ISCO, 6% NH4OH/MeOH/CH2Cl2, 40 g+12 g stacked column) to give 6.8 g of benzyl 4-(4-(3-carbamoyl-6-chloropyridin-2-ylamino)phenyl)piperazine-1-carboxylate as a brown solid. LCMS: (M+H)+=466.2, 468.2 (Cl pattern).

Workup

customThe reaction was quenched with water
extractionextracted three times with ethyl acetate
washThe combined organic layers were washed with water
concentrationconcentrated
customThe residue was purified by MPLC chromatography (ISCO, 6% NH4OH/MeOH/CH2Cl2, 40 g+12 g stacked column)

Sources & evidence

ORD record: ord-ed82fdfbc1834834a3fb5ece3f93fd51
Source dataset: uspto-grants-2013_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08586751B2

Reaction notes

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