(2,4-Dichlorophenyl)boronic acid → (1R,2S)-1-{[5-(2,4-dichlorophenyl)-3,6-diethylpyrazin-2-yl]amino}-2,3-dihydro-1H-inden-2-ol

HRID 1824022Notes

Reaction equation

HRID 1824022 reaction equation
Br[C:2]1[N:3]=[C:4]([CH2:21][CH3:22])[C:5]([NH:10][C@@H:11]2[C:19]3[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=3)[CH2:13][C@@H:12]2[OH:20])=[N:6][C:7]=1[CH2:8][CH3:9].[Cl:23][C:24]1[CH:29]=[C:28]([Cl:30])[CH:27]=[CH:26][C:25]=1B(O)O>C1C=CC=CC=1.C(=O)([O-])[O-].[Na+].[Na+]>[Cl:23][C:24]1[CH:29]=[C:28]([Cl:30])[CH:27]=[CH:26][C:25]=1[C:2]1[N:3]=[C:4]([CH2:21][CH3:22])[C:5]([NH:10][C@@H:11]2[C:19]3[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=3)[CH2:13][C@@H:12]2[OH:20])=[N:6][C:7]=1[CH2:8][CH3:9]

Participants

5

Reactant 2

HCID 2734659(2,4-Dichlorophenyl)boronic acidHCID 58583245(1R,2S)-1-[(5-bromo-3,6-diethylpyrazin-2-yl)amino]-2,3-dihydro-1H-inden-2-ol

Product 1

HCID 58583246(1R,2S)-1-{[5-(2,4-dichlorophenyl)-3,6-diethylpyrazin-2-yl]amino}-2,3-dihydro-1H-inden-2-olYield 133.7%

Reagents, catalysts & solvents 2

HCID 241BenzeneSolventHCID 10340Sodium CarbonateSolvent

Conditions

Temperature
80 °C

Procedure

A solution of (1R,2S)-1-[(5-bromo-3,6-diethylpyrazin-2-yl)amino]-2,3-dihydro-1H-inden-2-ol (1.48 g, 4.12 mmol) and 2,4-dichlorophenyl boronic acid (858 mg, 4.5 mmol) in benzene (41 mL) and 2M sodium carbonate (7 mL) was purged with nitrogen and treated with a single portion of bistriphenylphosphinepalladium(II)chloride (287 mg, 0.41 mmol). The resulting golden 2-phase solution was heated to 80° C. gradually darkening in color. After 16 hours, the reaction was cooled to room temperature, transferred to a separatory funnel, and washed with water (50 mL). The aqueous layer was extracted twice with ethyl acetate (75 mL) and the combined organics were washed once with brine (75 mL), dried over MgSO4, filtered, and concentrated to give 2.36 g of a brown syrup. This material was purified by biotage MPLC (90 g column, 20% ethyl acetate/heptane) to afford 1.25 g (71%) of the title compound as a tan solid. OAMS supporting ions at: ESI+ 428.0; HRMS (FAB) calcd for C23H23CL2N3O+H1 428.1296, found 428.1292.

Workup

  1. temperaturethe reaction was cooled to room temperature
  2. customtransferred to a separatory funnel
  3. washwashed with water (50 mL)
  4. extractionThe aqueous layer was extracted twice with ethyl acetate (75 mL)
  5. washthe combined organics were washed once with brine (75 mL)
  6. dry with materialdried over MgSO4
  7. filtrationfiltered
  8. concentrationconcentrated

Sources & evidence

ORD record
ord-f761cda7a3794d9ba45335b4e31814cc
Source dataset
uspto-grants-2006_05
Patent number
US07041672B2

Reaction notes

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