Hydrochloric Acid → 3-ethyl-4-(6-((2-(trimethylsilyl)ethoxy)methyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanone

HRID 1969884Notes

Reaction equation

HRID 1969884 reaction equation
[CH2:1]([CH:3]1[CH2:11][C:6]2(OCC[O:7]2)[CH2:5][CH:4]1[C:12]1[N:16]2[C:17]3[CH:23]=[CH:22][N:21]([CH2:24][O:25][CH2:26][CH2:27][Si:28]([CH3:31])([CH3:30])[CH3:29])[C:18]=3[N:19]=[CH:20][C:15]2=[N:14][N:13]=1)[CH3:2].Cl>C1COCC1>[CH2:1]([CH:3]1[CH:4]([C:12]2[N:16]3[C:17]4[CH:23]=[CH:22][N:21]([CH2:24][O:25][CH2:26][CH2:27][Si:28]([CH3:29])([CH3:31])[CH3:30])[C:18]=4[N:19]=[CH:20][C:15]3=[N:14][N:13]=2)[CH2:5][C:6](=[O:7])[CH2:11]1)[CH3:2]

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 585574851-(8-ethyl-1,4-dioxaspiro[4.4]nonan-7-yl)-6-((2-(trimethylsilyl)ethoxy)methyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazine

Product 1

HCID 585572963-ethyl-4-(6-((2-(trimethylsilyl)ethoxy)methyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanoneYield 81.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 1-(8-ethyl-1,4-dioxaspiro[4.4]nonan-7-yl)-6-((2-(trimethylsilyl)ethoxy)methyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazine (3.87 g, 8.72 mmol) in THF (30 mL), was added aqueous HCl (1N, 26.2 mL) at about 0° C. The ice bath was removed and the reaction was stirred at ambient temperature for about 6 h. THF was removed under reduced pressure. The aqueous phase was neutralized by the addition of saturated aqueous NaHCO3 and was extracted with EtOAc (2×50 mL). The combined organic extracts were washed with brine (60 mL), dried over anhydrous MgSO4, filtered, and concentrated. The residue was purified by silica gel column chromatography using 20 to 80% EtOAc in DCM to yield 3-ethyl-4-(6-((2-(trimethylsilyl)ethoxy)methyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanone (2.84 g, 81%) as a yellow amorphous solid. LC/MS (Table 1, Method a) Rt=2.44 min; MS m/z: 400 (M+H)+.

Workup

  1. customThe ice bath was removed
  2. customTHF was removed under reduced pressure
  3. additionThe aqueous phase was neutralized by the addition of saturated aqueous NaHCO3
  4. extractionwas extracted with EtOAc (2×50 mL)
  5. washThe combined organic extracts were washed with brine (60 mL)
  6. dry with materialdried over anhydrous MgSO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-4a49cdf378c8478bb651d2d21e6fd9fa
Source dataset
uspto-grants-2013_04
Patent number
US08426411B2

Reaction notes

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