Sodium hydride → tert-butyl 2-(4-(dibenzylamino)-2-methylcyclopentyl)-2-oxoethyl(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)carbamate

HRID 1969608Notes

Reaction equation

HRID 1969608 reaction equation
[H-].[Na+].[S:3]([N:13]1[C:17]2=[N:18][CH:19]=[C:20]([NH:22][C:23](=[O:29])[O:24][C:25]([CH3:28])([CH3:27])[CH3:26])[N:21]=[C:16]2[CH:15]=[CH:14]1)([C:6]1[CH:12]=[CH:11][C:9]([CH3:10])=[CH:8][CH:7]=1)(=[O:5])=[O:4].Br[CH2:31][C:32]([CH:34]1[CH2:38][CH:37]([N:39]([CH2:47][C:48]2[CH:53]=[CH:52][CH:51]=[CH:50][CH:49]=2)[CH2:40][C:41]2[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=2)[CH2:36][CH:35]1[CH3:54])=[O:33]>CN(C=O)C>[CH2:47]([N:39]([CH2:40][C:41]1[CH:42]=[CH:43][CH:44]=[CH:45][CH:46]=1)[CH:37]1[CH2:38][CH:34]([C:32](=[O:33])[CH2:31][N:22]([C:20]2[N:21]=[C:16]3[CH:15]=[CH:14][N:13]([S:3]([C:6]4[CH:7]=[CH:8][C:9]([CH3:10])=[CH:11][CH:12]=4)(=[O:5])=[O:4])[C:17]3=[N:18][CH:19]=2)[C:23](=[O:29])[O:24][C:25]([CH3:26])([CH3:28])[CH3:27])[CH:35]([CH3:54])[CH2:36]1)[C:48]1[CH:49]=[CH:50][CH:51]=[CH:52][CH:53]=1

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 580097831,1-Dimethylethyl N-(5-((4-methylphenyl)sulfonyl)-5H-pyrrolo(2,3-b)pyrazin-2-yl)carbamateHCID 585571452-Bromo-1-(4-(dibenzylamino)-2-methylcyclopentyl)ethanone

Product 1

HCID 58557498tert-butyl 2-(4-(dibenzylamino)-2-methylcyclopentyl)-2-oxoethyl(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)carbamateYield 97%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent3×

Procedure

To a suspension of NaH (60% dispersion in mineral oil, 0.058 g, 1.45 mmol) in DMF (5 mL) was added a solution of tert-butyl 5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-ylcarbamate (0.59 g, 1.519 mmol, Example #3, Step E) in DMF (5 mL) dropwise at about 0° C. The resulting mixture was stirred at this temperature for about 30 min and then added dropwise to a solution of 2-bromo-1-(4-(dibenzylamino)-2-methylcyclopentyl)ethanone (0.73 g, 1.823 mmol, Preparation #R.1) in DMF (10 mL). The resulting mixture was stirred at about 0° C. for about 1 h and the solvent was removed under reduced pressure. The residue was partitioned between saturated aqueous NaHCO3 and EtOAc (100 mL each). The organic phase was dried over anhydrous MgSO4 and concd under reduced pressure to yield tert-butyl 2-(4-(dibenzylamino)-2-methylcyclopentyl)-2-oxoethyl(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)carbamate (1.04 g, 97%) as a yellow amorphous solid: LC/MS (Table 1, Method a) Rt=3.30 min; MS m/z 708 (M+H)+.

Workup

  1. stirringThe resulting mixture was stirred at about 0° C. for about 1 h
  2. customthe solvent was removed under reduced pressure
  3. customThe residue was partitioned between saturated aqueous NaHCO3 and EtOAc (100 mL each)
  4. dry with materialThe organic phase was dried over anhydrous MgSO4 and concd under reduced pressure

Sources & evidence

ORD record
ord-899495df905e410491fe0ec5dbec5594
Source dataset
uspto-grants-2013_04
Patent number
US08426411B2

Reaction notes

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