Potassium Carbonate → 3-Methylbenzo[f][1,7]naphthyridin-5-amine

HRID 340206Notes

Reaction equation

HRID 340206 reaction equation
C(OC([NH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1B(O)O)=O)(C)(C)C.Br[C:19]1[C:20]([C:26]#[N:27])=[N:21][C:22]([CH3:25])=[CH:23][CH:24]=1.C(=O)([O-])[O-].[K+].[K+]>C1(C)C=CC=CC=1.CO.ClCCl.O>[CH3:25][C:22]1[CH:23]=[CH:24][C:19]2[C:20](=[C:26]([NH2:27])[N:8]=[C:9]3[CH:14]=[CH:13][CH:12]=[CH:11][C:10]3=2)[N:21]=1

Participants

8

Reactant 3

HCID 11430Potassium CarbonateHCID 2773226(2-BOC-aminophenyl)boronic acidHCID 219527473-Bromo-6-methylpyridine-2-carbonitrile

Product 1

HCID 442304763-Methylbenzo[f][1,7]naphthyridin-5-amine

Reagents, catalysts & solvents 4

HCID 887MethanolSolventHCID 962WaterSolventHCID 1140TolueneSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
100 °C

Procedure

A solution of 2-(tert-butoxycarbonylamino)phenylboronic acid (1.0 eq.) and 3-bromo-6-methylpicolinonitrile (from step 2) (1.0 eq.) in toluene (0.44 M) was mixed with tetrakis(triphenyl-phosphine)palladium (5 mol %) and 2N aqueous potassium carbonate solution (2.0 eq.). The reaction was heated to 100° C. and stirred overnight. After cooling to ambient temperature, the reaction content was diluted with 2% methanol in dichloromethane and water. The two phases were separated, and the aqueous layer was extracted twice with 2% methanol in dichloromethane. The combined organic layers were washed with brine, dried over anhydrous MgSO4, and concentrated en vacuo. The crude product was purified by flash chromatography on a COMBIFLASH® system (ISCO) using 0-70% ethyl acetate in hexane to give 3-methylbenzo[f][1,7]naphthyridin-5-amine as a yellow solid. 1H NMR (methanol d-4): δ 8.85 (d, 1H), 8.38 (d, 1H), 7.72 (d, 1H), 7.53-7.61 (m, 2H), 7.34-7.38 (dd, 1H), 2.76 (s, 3H). LRMS [M+H]=210.1

Workup

  1. temperatureAfter cooling to ambient temperature
  2. customThe two phases were separated
  3. extractionthe aqueous layer was extracted twice with 2% methanol in dichloromethane
  4. washThe combined organic layers were washed with brine
  5. dry with materialdried over anhydrous MgSO4
  6. concentrationconcentrated en vacuo
  7. customThe crude product was purified by flash chromatography on a COMBIFLASH® system (ISCO)

Sources & evidence

ORD record
ord-25b2ee7e731d4013951913b7628f9f2e
Source dataset
uspto-grants-2014_11
Patent number
US08895577B2

Reaction notes

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