Sodium Carbonate → 1-tert-butyl 2-methyl 4-[4-(4-aminophenoxy)pyridin-2-yl]-1H-pyrrole-1,2-dicarboxylate

HRID 521807Notes

Reaction equation

HRID 521807 reaction equation
Cl[C:2]1[CH:7]=[C:6]([O:8][C:9]2[CH:15]=[CH:14][C:12]([NH2:13])=[CH:11][CH:10]=2)[CH:5]=[CH:4][N:3]=1.CC1(C)C(C)(C)OB([C:24]2[CH:25]=[C:26]([C:36]([O:38][CH3:39])=[O:37])[N:27]([C:29]([O:31][C:32]([CH3:35])([CH3:34])[CH3:33])=[O:30])[CH:28]=2)O1.C([O-])([O-])=O.[Na+].[Na+].O1CCOCC1>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.O>[NH2:13][C:12]1[CH:14]=[CH:15][C:9]([O:8][C:6]2[CH:5]=[CH:4][N:3]=[C:2]([C:24]3[CH:25]=[C:26]([C:36]([O:38][CH3:39])=[O:37])[N:27]([C:29]([O:31][C:32]([CH3:35])([CH3:34])[CH3:33])=[O:30])[CH:28]=3)[CH:7]=2)=[CH:10][CH:11]=1

Participants

7

Reactant 4

HCID 10340Sodium CarbonateHCID 312751,4-DioxaneHCID 445577501-tert-butyl 2-methyl 4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrole-1,2-dicarboxylateHCID 578334304-(2-Chloro-pyridin-4-yloxy)-phenylamine

Product 1

HCID 581679381-tert-butyl 2-methyl 4-[4-(4-aminophenoxy)pyridin-2-yl]-1H-pyrrole-1,2-dicarboxylate

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 962WaterSolvent

Conditions

Temperature
70 °C

Procedure

A 100 ml flask was charged with 4-((2-chloropyridin-4-yl)oxy)aniline (150 mg, 0.68 mmol), 1-tert-butyl 2-methyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrole-1,2-dicarboxylate (260 mg, 0.8 mmol), 2M Na2CO3 solution (0.5 ml, 1.0 mmol), PdCl2(PPh3)2 (5 mg, 0.007 mmol), 10 ml of 1,4-dioxane and 3 ml of water. The mixture was flushed with nitrogen and heated at 70° C. for 30 minutes. The mixture was cooled to room temperature and poured into 100 ml of water. The precipitates were filtered and dried to give the crude, which was further purified by silica gel chromatography eluting with 2-3% MeOH/CHCl3 to give 1-tert-butyl 2-methyl 4-[4-(4-aminophenoxy)pyridin-2-yl]-1H-pyrrole-1,2-dicarboxylate as light brown oil. Yield: 240 mg, 86%.

Workup

  1. customThe mixture was flushed with nitrogen
  2. temperatureThe mixture was cooled to room temperature
  3. additionpoured into 100 ml of water
  4. filtrationThe precipitates were filtered
  5. customdried
  6. customto give the crude, which
  7. customwas further purified by silica gel chromatography
  8. washeluting with 2-3% MeOH/CHCl3

Sources & evidence

ORD record
ord-7e89d0d6e16f47d197aa5a8fc5d3cea5
Source dataset
uspto-grants-2016_05
Patent number
US09328103B2

Reaction notes

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