Sodium Bicarbonate → 6-[({1-[2-(6-Methoxy-3-oxopyrido[2,3-b]pyrazin-4(3H)-yl)ethyl]piperidin-4-yl}amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one

HRID 656990Notes

Reaction equation

HRID 656990 reaction equation
[NH2:1][CH:2]1[CH2:7][CH2:6][N:5]([CH2:8][CH2:9][N:10]2[C:15](=[O:16])[CH:14]=[N:13][C:12]3[CH:17]=[CH:18][C:19]([O:21][CH3:22])=[N:20][C:11]2=3)[CH2:4][CH2:3]1.[O:23]=[C:24]1[CH2:29][O:28][C:27]2[CH:30]=[CH:31][C:32]([CH:34]=O)=[N:33][C:26]=2[NH:25]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C([O-])(O)=O.[Na+]>C(Cl)Cl.CO>[CH3:22][O:21][C:19]1[CH:18]=[CH:17][C:12]2[N:13]=[CH:14][C:15](=[O:16])[N:10]([CH2:9][CH2:8][N:5]3[CH2:4][CH2:3][CH:2]([NH:1][CH2:34][C:32]4[CH:31]=[CH:30][C:27]5[O:28][CH2:29][C:24](=[O:23])[NH:25][C:26]=5[N:33]=4)[CH2:7][CH2:6]3)[C:11]=2[N:20]=1

Participants

7

Reactant 4

HCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 218737373-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carbaldehydeHCID 578153944-[2-(4-Aminopiperidin-1-yl)ethyl]-6-methoxypyrido[2,3-b]pyrazin-3(4H)-one

Product 1

HCID 579281276-[({1-[2-(6-Methoxy-3-oxopyrido[2,3-b]pyrazin-4(3H)-yl)ethyl]piperidin-4-yl}amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-oneYield 52%

Reagents, catalysts & solvents 2

HCID 887MethanolSolvent2×HCID 6344DichloromethaneSolvent2×

Procedure

A solution of 4-[2-(4-amino-1-piperidinyl)ethyl]-6-(methyloxy)pyrido[2,3-b]pyrazin-3(4H)-one (50 mg, 0.1648 mmoles) and 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carboxaldehyde (for a synthesis see WO2003087098, Example 31(e)) (29.4 mg, 0.1648 mmoles) in anhydrous DCM (5 ml) and anhydrous MeOH (0.5 ml) was stirred at rt for 5 mins. Sodium triacetoxyborohydride (104.7 mg, 0.494 mmoles) was added and the mixture was stirred, under argon, for 24 h. The reaction was treated with sat. aq. NaHCO3 solution (2 ml) and 9:1 DCM:MeOH (5 ml). The layers were separated and the aqueous layer was washed with 9:1 DCM:MeOH (10 ml) and 5:1 DCM:MeOH (2×20 ml). The organic extracts were combined, passed through a hydrophobic frit and evaporated to an orange gum. Purification on a 10 g silica column eluted with an 80:20 DCM:MeOH elution gave the product as a yellow gum (39.8 mg, 52%).

Workup

  1. customThe layers were separated
  2. washthe aqueous layer was washed with 9:1 DCM
  3. customevaporated to an orange gum
  4. customPurification on a 10 g silica column
  5. washeluted with an 80:20 DCM
  6. washMeOH elution

Sources & evidence

ORD record
ord-125d2feaaae44534915b129174fd2a34
Source dataset
uspto-grants-2011_12
Patent number
US08071592B2

Reaction notes

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