Acetic Acid → N4-Ethyl-6-methyl-N2-(4-(oxazol-5-yl)phenyl)-N4-((tetrahydrofuran-2-yl)methyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine

HRID 1930668Notes

Reaction equation

HRID 1930668 reaction equation
[CH2:1]([N:3]([CH2:26][CH:27]1[CH2:31][CH2:30][CH2:29][O:28]1)[C:4]1[C:5]2[CH2:25][NH:24][CH2:23][CH2:22][C:6]=2[N:7]=[C:8]([NH:10][C:11]2[CH:16]=[CH:15][C:14]([C:17]3[O:21][CH:20]=[N:19][CH:18]=3)=[CH:13][CH:12]=2)[N:9]=1)[CH3:2].[C:32](O)(=O)C.C=O.C([BH3-])#N.[Na+]>CO>[CH2:1]([N:3]([CH2:26][CH:27]1[CH2:31][CH2:30][CH2:29][O:28]1)[C:4]1[C:5]2[CH2:25][N:24]([CH3:32])[CH2:23][CH2:22][C:6]=2[N:7]=[C:8]([NH:10][C:11]2[CH:12]=[CH:13][C:14]([C:17]3[O:21][CH:20]=[N:19][CH:18]=3)=[CH:15][CH:16]=2)[N:9]=1)[CH3:2]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 712FormaldehydeHCID 5003444Sodium cyanoborohydrideHCID 59333759N4-Ethyl-N2-(4-(oxazol-5-yl)phenyl)-N4-((tetrahydrofuran-2-yl)methyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine

Product 1

HCID 46199742N4-Ethyl-6-methyl-N2-(4-(oxazol-5-yl)phenyl)-N4-((tetrahydrofuran-2-yl)methyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

N4-Ethyl-N2-(4-(oxazol-5-yl)phenyl)-N4-((tetrahydrofuran-2-yl)methyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine (125 mg, 0.30 mmol, example 81a) was dissolved in methanol (3 mL). Acetic acid (0.017 mL, 0.30 mmol) was added followed by formaldehyde (0.022 mL, 0.30 mmol). The reaction was stirred at room temperature for 15 minutes and sodium cyanoborohydride (18.7 mg, 0.30 mmol) (MP—CNBH3) was added. The reaction was stirred overnight at room temperature. The MP—CNBH3 was filtered, the solvent evaporated under reduced pressure, the crude dissolved in methanol and purified by preparative HPLC N4-ethyl-6-methyl-N2-(4-(oxazol-5-yl)phenyl)-N4-((tetrahydrofuran-2-yl)methyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine (29.8 mg, 21.04%) as acetate salt. MS (ES+) m/z 435.2 (M+H)+

Workup

  1. stirringThe reaction was stirred overnight at room temperature
  2. filtrationThe MP—CNBH3 was filtered
  3. customthe solvent evaporated under reduced pressure
  4. dissolutionthe crude dissolved in methanol
  5. custompurified by preparative HPLC N4-ethyl-6-methyl-N2-(4-(oxazol-5-yl)phenyl)-N4-((tetrahydrofuran-2-yl)methyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine (29.8 mg, 21.04%) as acetate salt

Sources & evidence

ORD record
ord-ec60bacc885f434e9023e78971b9cfbf
Source dataset
uspto-grants-2012_05
Patent number
US08188101B2

Reaction notes

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