Trifluoroacetic acid → ethyl (2E)-3-(5-{[(3R)-1-benzyl-3-pyrrolidinyl]amino}-2-pyrazinyl)acrylate

HRID 2376144Notes

Reaction equation

HRID 2376144 reaction equation
[CH2:1]([N:8]1[CH2:12][CH2:11][C@@H:10]([N:13](C(OC(C)(C)C)=O)[C:14]2[N:15]=[CH:16][C:17](/[CH:20]=[CH:21]/[C:22]([O:24][CH2:25][CH3:26])=[O:23])=[N:18][CH:19]=2)[CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C1(OC)C=CC=CC=1.FC(F)(F)C(O)=O.C([O-])(O)=O.[Na+]>ClCCl.CCOC(C)=O.O>[CH2:1]([N:8]1[CH2:12][CH2:11][C@@H:10]([NH:13][C:14]2[N:15]=[CH:16][C:17](/[CH:20]=[CH:21]/[C:22]([O:24][CH2:25][CH3:26])=[O:23])=[N:18][CH:19]=2)[CH2:9]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

8

Reactant 4

HCID 6422Trifluoroacetic acidHCID 7519AnisoleHCID 516892Sodium BicarbonateHCID 86603754ethyl (2E)-3-(5-{[(3R)-1-benzyl-3-pyrrolidinyl](tert-butoxycarbonyl)amino}-2-pyrazinyl)acrylate

Product 1

HCID 86603676ethyl (2E)-3-(5-{[(3R)-1-benzyl-3-pyrrolidinyl]amino}-2-pyrazinyl)acrylateYield 85%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
25 °C

Procedure

To an ice-cooled solution of ethyl (2E)-3-(5-{[(3R)-1-benzyl-3-pyrrolidinyl](tert-butoxycarbonyl)amino}-2-pyrazinyl)acrylate (4.63 g) in dichloromethane (7.8 ml) were added anisole (4.7 ml) and trifluoroacetic acid (15.6 ml), the mixture was stirred at 25° C. for 3.5 hours. The mixed solution was poured into a mixture of water and AcOEt. The pH of the aqueous layer was adjusted to ca.8 with NaHCO3. The organic layer was separated, washed with brine, dried over sodium sulfate and evaporated under reduced pressure to give crude powder. The resulting residue was purified by column chromatography on silica gel (50 g) using a mixed solvent of CH2Cl2 and MeOH (100:1 to 20:1). The fractions containing the objective compound were collected and evaporated under reduced pressure. Title compound (3.05 g, 85%) was obtained as slightly yellowish powder.

Workup

  1. customThe organic layer was separated
  2. washwashed with brine
  3. dry with materialdried over sodium sulfate
  4. customevaporated under reduced pressure
  5. customto give crude powder
  6. customThe resulting residue was purified by column chromatography on silica gel (50 g)
  7. additionThe fractions containing the objective compound
  8. customwere collected
  9. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-be17276b5b3f43f2a9cb73da736517e1
Source dataset
uspto-grants-2008_12
Patent number
US07465731B2

Reaction notes

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