Diisopropylethylamine → 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amide

HRID 246228Notes

Reaction equation

HRID 246228 reaction equation
[Br:1][C:2]1[N:3]=[C:4]2[C:10]([C:11]([OH:13])=O)=[CH:9][N:8]([CH2:14][O:15][CH2:16][CH2:17][Si:18]([CH3:21])([CH3:20])[CH3:19])[C:5]2=[N:6][CH:7]=1.[CH2:22]([N:29]1[CH2:33][CH2:32][C@@H:31]([NH2:34])[CH2:30]1)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.CCN(C(C)C)C(C)C.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>CN(C=O)C.ClCCl>[CH2:22]([N:29]1[CH2:33][CH2:32][C@@H:31]([NH:34][C:11]([C:10]2[C:4]3[C:5](=[N:6][CH:7]=[C:2]([Br:1])[N:3]=3)[N:8]([CH2:14][O:15][CH2:16][CH2:17][Si:18]([CH3:21])([CH3:20])[CH3:19])[CH:9]=2)=[O:13])[CH2:30]1)[C:23]1[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=1

Participants

7

Reactant 4

HCID 81531DiisopropylethylamineHCID 1519354(3R)-1-benzylpyrrolidin-3-amineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 584385252-bromo-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid

Product 1

HCID 866779622-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amideYield 97%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

In a 100 mL round-bottomed flask, 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (1.0 g, 2.69 mmol) was combined with dichloromethane (3 ml) to give a yellow solution. (R)-1-Benzylpyrrolidin-3-amine (710 mg, 4.03 mmol) and then DIEA (1.88 ml, 10.7 mmol) were added. To the clear solution was added HATU (2.04 g, 5.37 mmol) and to this mixture was added DMF (4 ml). The reaction was stirred under nitrogen overnight then concentrated and partioned between water (100 ml) and EtOAc (100 ml). The aqueous layer was washed with EtOAc (50 ml) then the combined organics were washed with brine, dried over MgSO4, filtered and concentrated. The crude was dissolved in EtOAc, supported on silica gel, and purified by flash chromatography (120 g silicycle) with 0% to 100% EtOAc in hexanes. The appropriate fractions combined and concentrated to yield 1.38 g (97%) of 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amide as a clear viscous semisolid with a slight red/brown tint. LC-MS (M+H)+=530.

Workup

  1. customto give a yellow solution
  2. concentrationthen concentrated
  3. washThe aqueous layer was washed with EtOAc (50 ml)
  4. washthe combined organics were washed with brine
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. dissolutionThe crude was dissolved in EtOAc
  9. custompurified by flash chromatography (120 g silicycle) with 0% to 100% EtOAc in hexanes
  10. concentrationconcentrated

Sources & evidence

ORD record
ord-8194ed0f88a842a486477abeda3e2504
Source dataset
uspto-grants-2014_02
Patent number
US08658646B2

Reaction notes

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