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

HRID 1479469Notes

Reaction equation

HRID 1479469 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:25]#[N:26])=[N:21][CH:22]=[CH:23][CH:24]=1.C(=O)([O-])[O-].[K+].[K+]>C1(C)C=CC=CC=1.CO.ClCCl.O>[CH:24]1[C:19]2[C:20](=[C:25]([NH2:26])[N:8]=[C:9]3[CH:14]=[CH:13][CH:12]=[CH:11][C:10]3=2)[N:21]=[CH:22][CH:23]=1

Participants

8

Reactant 3

HCID 11430Potassium CarbonateHCID 8176943-Bromopyridine-2-carbonitrileHCID 2773226(2-BOC-aminophenyl)boronic acid

Product 1

HCID 10910433Benzo[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-bromopicolino-nitrile (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 material was purified by flash chromatography on a COMBIFLASH® system (ISCO) using 0-80% ethyl acetate in hexane to give a white solid. 1H NMR (acetone d-6): δ 9.04 (d, 1H), 8.91 (d, 1H), 8.45 (d, 1H), 7.86 (dd, 1H), 7.53-7.62 (m, 2H), 7.35 (t, 1H), 6.65 (br, 2H). LRMS [M+H]=196.1

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 material was purified by flash chromatography on a COMBIFLASH® system (ISCO)
  8. customto give a white solid

Sources & evidence

ORD record
ord-fe698a9c53f14b45b6ee3a832d635b06
Source dataset
uspto-grants-2016_08
Patent number
US09408907B2

Reaction notes

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