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3-Methylbutanal → 3-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-5-(1-hydroxy-3-methylbutyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione

HRID 60157
Notes
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Reaction equation

HRID 60157 reaction equation
[Si:1]([O:8][CH2:9][CH2:10][CH2:11][N:12]1[C:17](=[O:18])[C:16]2[C:19]([CH:24]([C:26]3C=CC(Cl)=[CH:28][CH:27]=3)[OH:25])=[C:20]([Cl:23])[N:21]=[CH:22][C:15]=2[N:14]([CH3:33])[C:13]1=[O:34])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[Li+].[CH3:36]C([N-]C(C)C)C.CC(C)CC=O>C1COCC1>[Si:1]([O:8][CH2:9][CH2:10][CH2:11][N:12]1[C:17](=[O:18])[C:16]2[C:19]([CH:24]([OH:25])[CH2:26][CH:27]([CH3:36])[CH3:28])=[C:20]([Cl:23])[N:21]=[CH:22][C:15]=2[N:14]([CH3:33])[C:13]1=[O:34])([C:4]([CH3:5])([CH3:7])[CH3:6])([CH3:2])[CH3:3]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 115523-MethylbutanalHCID 2724682Lithium diisopropylamideHCID 1317370763-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-5-((4-chlorophenyl) (hydroxy)methyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione2×

Product 1

HCID 1317370773-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-5-(1-hydroxy-3-methylbutyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dioneYield 32.9%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
-78 °C

Procedure

To a solution of 3-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione (See Compound 49, step 3, 1.149 g, 3 mmol) in THF (30 mL) at −78° C. was added LDA (2M in THF, 7.5 mL, 15 mmol) dropwise. The reaction was stirred at −78° C. for 30 min then 3-methylbutanal (516 mg, 6 mmol) in THF (5 mL) was added dropwise. The reaction was stirred at −78° C. for 20 min, quenched with aq. NH4Cl (5 mL) then diluted with EA (15 mL) and water (5 mL). The organic layer was washed with brine (20 mL), dried over Na2SO4 and concentrated to a residue which was purified by chromatography eluted with PE/EA (2:1) to give 3-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-5-(1-hydroxy-3-methylbutyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione (464 mg, 30% yield) as a white solid. LCMS: MH+ 470 and TR=2.198 min.

Workup

  1. stirringThe reaction was stirred at −78° C. for 20 min
  2. customquenched with aq. NH4Cl (5 mL)
  3. additionthen diluted with EA (15 mL) and water (5 mL)
  4. washThe organic layer was washed with brine (20 mL)
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated to a residue which
  7. customwas purified by chromatography
  8. washeluted with PE/EA (2:1)

Sources & evidence

ORD record
ord-0e41429d939a45ddb02b8777bcd9c56b
Source dataset
uspto-grants-2016_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09440973B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes