Sodium Carbonate → 5-Nitro-3,3'-bipyridin-4-amine

HRID 877128Notes

Reaction equation

HRID 877128 reaction equation
Br[C:2]1[CH:3]=[N:4][CH:5]=[C:6]([N+:9]([O-:11])=[O:10])[C:7]=1[NH2:8].[N:12]1[CH:17]=[CH:16][CH:15]=[C:14](B(O)O)[CH:13]=1.C([O-])([O-])=O.[Na+].[Na+]>Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O1CCOCC1>[N+:9]([C:6]1[C:7]([NH2:8])=[C:2]([C:14]2[CH:13]=[N:12][CH:17]=[CH:16][CH:15]=2)[CH:3]=[N:4][CH:5]=1)([O-:11])=[O:10]

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 27343783-Pyridinylboronic acidHCID 49975884-Amino-3-bromo-5-nitropyridine

Product 1

HCID 581355295-Nitro-3,3'-bipyridin-4-amineYield 88.8%

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 312751,4-DioxaneSolvent

Procedure

A solution of 3-bromo-5-nitropyridin-4-amine (LVIII) (6 g, 26 mmol), pyridin-3-ylboronic acid (3.54 g, 29 mmol), 1 N Na2CO3 solution (78 ml) and 1,4-dioxane (150 mL) was degassed with argon thrice. Pd(PPh3)2Cl2 (927 mg, 5 mmol %) was added to the reaction and the solution was refluxed for 15 h until TLC showed the reaction was complete. The reaction was passed through a pad of Celite® and then concentrated under reduced pressure. The reaction mixture was concentrated and the residue was taken up in EtOAc. The organic extract was washed with water, dried and concentrated under vacuum. The crude product was purified on a silica gel column (100% EtOAc→2:98 MeOH:DCM) to give 5-nitro-3,3′-bipyridin-4-amine (LIX) as a yellow solid (5 g, 23.1 mmol, 87% yield). 1H NMR (CDCl3, 500 MHz,) δ ppm 9.31 (s, 1H), 8.80-8.79 (m, 1H), 8.70 (s, 1H), 8.23 (s, 1H), 7.80-7.73 (m, 1H), 7.52-7.48 (m, 1H). ESIMS found C10H8N4O2 m/z 216.95 (M+H).

Workup

  1. temperaturethe solution was refluxed for 15 h until TLC
  2. concentrationconcentrated under reduced pressure
  3. concentrationThe reaction mixture was concentrated
  4. extractionThe organic extract
  5. washwas washed with water
  6. customdried
  7. concentrationconcentrated under vacuum
  8. customThe crude product was purified on a silica gel column (100% EtOAc→2:98 MeOH:DCM)

Sources & evidence

ORD record
ord-4b8e7f8e8fd2415e875774ce6b338b58
Source dataset
uspto-grants-2015_03
Patent number
US08987298B2

Reaction notes

Loading…