Sodium Carbonate → tert-butyl 4-(5-(bis(tert-butoxycarbonyl)amino)-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate

HRID 1959366Notes

Reaction equation

HRID 1959366 reaction equation
Br[C:2]1[N:3]=[C:4]([C:23]2[O:24][C:25]([C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)=[N:26][N:27]=2)[C:5]([N:8]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[N:6][CH:7]=1.CC1(C)C(C)(C)OB([C:42]2[CH2:43][CH2:44][N:45]([C:48]([O:50][C:51]([CH3:54])([CH3:53])[CH3:52])=[O:49])[CH2:46][CH:47]=2)O1.C([O-])([O-])=O.[Na+].[Na+]>CN(C=O)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[C:11]([O:10][C:9]([N:8]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:5]1[N:6]=[CH:7][C:2]([C:42]2[CH2:47][CH2:46][N:45]([C:48]([O:50][C:51]([CH3:54])([CH3:53])[CH3:52])=[O:49])[CH2:44][CH:43]=2)=[N:3][C:4]=1[C:23]1[O:24][C:25]([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)=[N:26][N:27]=1)=[O:15])([CH3:14])([CH3:13])[CH3:12]

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 59471994Tert-butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate

Product 1

HCID 66744435tert-butyl 4-(5-(bis(tert-butoxycarbonyl)amino)-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-5,6-dihydropyridine-1(2H)-carboxylateYield 81.4%

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

Tert-butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (2.4633 g, 4.752 mmol) was dissolved in DMF (19.24 mL) and tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylate (2.204 g, 7.128 mmol) and Pd(PPh3)2Cl2 (196.6 mg, 0.4752 mmol) were added followed by Na2CO3 (7.130 mL of 2 M, 14.26 mmol) and the reaction heated at 100° C. under nitrogen for 15 minutes. The reaction mixture was allowed to cool to RT and the solvent removed in vacuo. The mixture was diluted with EtOAc/water and the organic layer washed with water (×4) followed by brine (×3). After drying over MgSO4, the reaction was filtered and evaporated to dryness to give a dark brown oil which was purified on silica gel by flash column chromatography (0-40% EtOAc/Petrol) to afford the title compound (2.40 g, 81% Yield).

Workup

  1. temperatureto cool to RT
  2. customthe solvent removed in vacuo
  3. additionThe mixture was diluted with EtOAc/water
  4. washthe organic layer washed with water (×4)
  5. dry with materialAfter drying over MgSO4
  6. filtrationthe reaction was filtered
  7. customevaporated to dryness
  8. customto give a dark brown oil which
  9. customwas purified on silica gel by flash column chromatography (0-40% EtOAc/Petrol)

Sources & evidence

ORD record
ord-ecab118e7a684039a74bb6fc4d094f87
Source dataset
uspto-grants-2013_04
Patent number
US08410112B2

Reaction notes

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