p-Toluenesulfonic acid → 6-chloro-2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purine

HRID 1811768Notes

Reaction equation

HRID 1811768 reaction equation
[Cl:1][C:2]1[N:10]=[C:9]([CH3:11])[N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][NH:6]2.C1(C)C=CC(S(O)(=O)=O)=CC=1.[O:23]1[CH:28]=[CH:27][CH2:26][CH2:25][CH2:24]1.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[Cl:1][C:2]1[N:10]=[C:9]([CH3:11])[N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[CH:24]1[CH2:25][CH2:26][CH2:27][CH2:28][O:23]1

Participants

6

Reactant 4

HCID 6101p-Toluenesulfonic acidHCID 80803,4-dihydro-2H-pyranHCID 516892Sodium BicarbonateHCID 178432856HCID 178432856, compound2×

Product 1

HCID 595482686-chloro-2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purineYield 97%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
50 °C

Procedure

6-Chloro-2-methyl-9H-purine (9.45 g, 56 mmol, the material from Step 2) was suspended in DCM (100 mL) and p-toluenesulfonic acid (Acros Organics, Geel, Belgium, 12% in acetic acid, 0.90 mL, 5.6 mmol) and 2,3-dihydropyran (6.6 mL, 73 mmol) were added. The reaction flask was fitted with a reflux condenser and placed in a preheated oil bath (50° C.) and stirred under nitrogen for 30 minutes. Then, the reaction was cooled to room temperature and stirred overnight. After stirring overnight, the reaction was diluted with DCM and treated with saturated sodium bicarbonate (75 mL). The layers were separated, and the aqueous phase was extracted with DCM. The organic extracts were combined, dried over sodium sulfate, filtered, concentrated, and dried under high vacuum at 45° C. (in a water bath) and then at room temperature and then at 60° C. and finally at room temperature again to afford 6-chloro-2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purine (13.73 g, 97% over 3 steps). MS (ESI pos. ion) m/z: 253. Calculated exact mass for C11H13ClN4O: 252. 1H NMR (CDCl3, 400 MHz) δ 8.26 (s, 1H), 5.78 (d, J=10.56 Hz, 1H), 4.19 (d, J=11.93 Hz, 1H), 3.84-3.76 (m, 1H), 2.80 (s, 3H), 2.20-1.96 (m, 3H), 1.89-1.64 (m, 3H).

Workup

  1. customThe reaction flask was fitted with a reflux condenser
  2. customplaced in a preheated oil bath
  3. temperatureThen, the reaction was cooled to room temperature
  4. stirringstirred overnight
  5. stirringAfter stirring overnight
  6. customThe layers were separated
  7. extractionthe aqueous phase was extracted with DCM
  8. dry with materialdried over sodium sulfate
  9. filtrationfiltered
  10. concentrationconcentrated
  11. customdried under high vacuum at 45° C. (in a water bath)

Sources & evidence

ORD record
ord-2f82fcc56d3f42af9eb566a029ee187f
Source dataset
uspto-grants-2013_01
Patent number
US08362241B2

Reaction notes

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