2-(5-formyl-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide → 2-[5-(1-hydroxy-ethyl)-1-methyl-1H-indazol-3-yl]-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide

HRID 246322Notes

Reaction equation

HRID 246322 reaction equation
[CH:1]([NH:4][C:5]([C:7]1[C:15]2[C:10](=[N:11][CH:12]=[C:13]([C:16]3[C:24]4[C:19](=[CH:20][CH:21]=[C:22]([CH:25]=[O:26])[CH:23]=4)[N:18]([CH3:27])[N:17]=3)[N:14]=2)[N:9]([CH2:28][O:29][CH2:30][CH2:31][Si:32]([CH3:35])([CH3:34])[CH3:33])[CH:8]=1)=[O:6])([CH3:3])[CH3:2].[CH3:36][Mg]Br>C1COCC1>[CH:1]([NH:4][C:5]([C:7]1[C:15]2[C:10](=[N:11][CH:12]=[C:13]([C:16]3[C:24]4[C:19](=[CH:20][CH:21]=[C:22]([CH:25]([OH:26])[CH3:36])[CH:23]=4)[N:18]([CH3:27])[N:17]=3)[N:14]=2)[N:9]([CH2:28][O:29][CH2:30][CH2:31][Si:32]([CH3:33])([CH3:35])[CH3:34])[CH:8]=1)=[O:6])([CH3:3])[CH3:2]

Participants

4

Reactant 2

HCID 866779732-(5-formyl-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamideHCID 178418573HCID 178418573, compound

Product 1

HCID 712794062-[5-(1-hydroxy-ethyl)-1-methyl-1H-indazol-3-yl]-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamideYield 37%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

In a round-bottomed flask, 2-(5-formyl-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide (111 mg, 0.225 mmol) was suspended in THF (3 ml). The pale yellow suspension was cooled to 0° C. and methylmagnesium bromide (3.0 M in diethyl ether, 0.23 ml, 0.69 mmol) was added dropwise. The dark red suspension was stirred at 0° C. for 1 h then quenched with saturated aqueous NH4Cl and extracted with dichloromethane (2×). The organic layers were combined, dried over sodium sulfate, filtered and concentrated. The residue was chromatographed over 12 g silica gel with EtOAc/hexanes (gradient: 0-80% EtOAc) to afford 42 mg (37%) of 2-[5-(1-hydroxy-ethyl)-1-methyl-1H-indazol-3-yl]-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide as a light yellow solid.

Workup

  1. customthen quenched with saturated aqueous NH4Cl
  2. extractionextracted with dichloromethane (2×)
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was chromatographed over 12 g silica gel with EtOAc/hexanes (gradient: 0-80% EtOAc)

Sources & evidence

ORD record
ord-2a0c376fb5254e93b78a038ef56dc18c
Source dataset
uspto-grants-2014_02
Patent number
US08658646B2

Reaction notes

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