Triethylamine → 5-(2,4-dichlorophenyl)-N-[(cis)-4-ethoxypyrrolidin-3-yl]-3,6-diethylpyrazin-2-amine

HRID 1297290Notes

Reaction equation

HRID 1297290 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[N:10]=[C:11]([CH2:36][CH3:37])[C:12]([NH:17][C@H:18]2[C@@H:22]([O:23][CH2:24][CH3:25])[CH2:21][N:20](C(OCC3C=CC=CC=3)=O)[CH2:19]2)=[N:13][C:14]=1[CH2:15][CH3:16].C(N(CC)CC)C.C([SiH](CC)CC)C>C(Cl)Cl.[Pd](Cl)Cl>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[N:10]=[C:11]([CH2:36][CH3:37])[C:12]([NH:17][C@H:18]2[C@@H:22]([O:23][CH2:24][CH3:25])[CH2:21][NH:20][CH2:19]2)=[N:13][C:14]=1[CH2:15][CH3:16]

Participants

6

Reactant 3

HCID 8471TriethylamineHCID 12052Triethylsilane2×HCID 10196417Benzyl (cis)-3-{[5-(2,4-dichlorophenyl)-3,6-diethylpyrazin-2-yl]amino}-4-ethoxypyrrolidine-1-carboxylate

Product 1

HCID 103098205-(2,4-dichlorophenyl)-N-[(cis)-4-ethoxypyrrolidin-3-yl]-3,6-diethylpyrazin-2-amineYield 92%

Reagents, catalysts & solvents 2

HCID 24290Palladium ChlorideCatalystHCID 6344DichloromethaneSolvent

Procedure

To a solution of benzyl (3R,4S)-3-{[5-(2,4-dichlorophenyl)-3,6-diethylpyrazin-2-yl]amino}4-ethoxypyrrolidine-1-carboxylate (8.60 g, 15.8 mmole) in CH2Cl2 (0.1M, 158 ml) under N2 was added Palladium chloride (279 mg, 1.58 mmole) and triethyl amine (3.29 ml, 1.5 eq.). Triethylsilane (3.78 ml, 1.5 eq.) was added dropwise over 15 min. After one hour an additional 8.74 ml of triethylsilane was added dropwise. After 2 additional hours, the reaction mixture was filtered through celite. Trifluoroacetic acid (8 ml) was added and the reaction mixture was stirred for 30 min. Quenched to pH 10 with 2N NaOH and extracted 3×300 ml of CH2Cl2, dried MgSO4, filtered and concentrated. Vacuum chromatography was run on a 1 L frit funnel with 5–15% MeOH/CH2Cl2 with 0.5% NH4OH to give 5.95 g (92%) of an oil. 1H NMR (400 MHz, CDCl3) δ) 7.49, 7.33–7.26, 5.38, 4.54, 4.07, 3.68, 3.52, 3.22, 2.95, 2.71, 2.46, 1.29, 1.15; HRMS (FAB) calcd for C20H26Cl2N4O+H 409.1562. found 409.1567. Anal. Calcd for C20H26Cl2N4O: C, 58.68; H, 6.40; N, 13.69. Found: C, 58.42; H, 6.43; N, 13.50.

Workup

  1. filtrationAfter 2 additional hours, the reaction mixture was filtered through celite
  2. additionTrifluoroacetic acid (8 ml) was added
  3. customQuenched to pH 10 with 2N NaOH
  4. extractionextracted 3×300 ml of CH2Cl2, dried MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customVacuum chromatography was run on a 1 L frit funnel with 5–15% MeOH/CH2Cl2 with 0.5% NH4OH

Sources & evidence

ORD record
ord-defa2b06d8fb42b59edd18616bdf2fab
Source dataset
uspto-grants-2007_07
Patent number
US07250418B2

Reaction notes

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