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

HRID 60175Notes

Reaction equation

HRID 60175 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]3[CH:31]=[CH:30][C:29](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+].CC([N-]C(C)C)C.C(=O)C1C=CC=CC=1>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])[C:26]3[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=3)=[C:20]([Cl:23])[N:21]=[CH:22][C:15]=2[N:14]([CH3:33])[C:13]1=[O:34])([C:4]([CH3:6])([CH3:7])[CH3:5])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 240BenzaldehydeHCID 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 1317370873-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-5-(hydroxy(phenyl)methyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H, 3H)-dioneYield 30.7%

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, 1.15 mg, 3.0 mmol) in THF (30 mL) at −78° C. was added LDA (2M in THF, 6 mL, 12 mmol) dropwise. The reaction was stirred at −78° C. for 30 min then benzaldehyde (636 mg, 6.0 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 (30 mL) and water (8 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-(hydroxy(phenyl)methyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H, 3H)-dione (450 mg, 30.7% yield) as a colorless oil. LCMS: [M+-OH] 472 and TR=2.058 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 (30 mL) and water (8 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-91e17031bf3142658f88af6abda5b98f
Source dataset
uspto-grants-2016_09
Patent number
US09440973B2

Reaction notes

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