Sodium Carbonate → 9-Dicyclopropylmethyl-8-ethyl-6-(6-methyl-2,3-dihydrobenzofuran-5-yl)purine

HRID 1856683Notes

Reaction equation

HRID 1856683 reaction equation
[CH3:1][C:2]1[C:10](B(O)O)=[CH:9][C:5]2[CH2:6][CH2:7][O:8][C:4]=2[CH:3]=1.Cl[C:15]1[N:23]=[CH:22][N:21]=[C:20]2[C:16]=1[N:17]=[C:18]([CH2:31][CH3:32])[N:19]2[CH:24]([CH:28]1[CH2:30][CH2:29]1)[CH:25]1[CH2:27][CH2:26]1.C(=O)([O-])[O-].[Na+].[Na+].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>COCCOC.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH:28]1([CH:24]([CH:25]2[CH2:27][CH2:26]2)[N:19]2[C:18]([CH2:31][CH3:32])=[N:17][C:16]3[C:20]2=[N:21][CH:22]=[N:23][C:15]=3[C:10]2[C:2]([CH3:1])=[CH:3][C:4]3[O:8][CH2:7][CH2:6][C:5]=3[CH:9]=2)[CH2:30][CH2:29]1

Participants

7

Reactant 4

HCID 10340Sodium CarbonateHCID 11776TriphenylphosphineHCID 180016036-Methyl-2,3-dihydrobenzofuran-5-boronic acidHCID 221436956-Chloro-9-dicyclopropylmethyl-8-ethylpurine

Product 1

HCID 180015049-Dicyclopropylmethyl-8-ethyl-6-(6-methyl-2,3-dihydrobenzofuran-5-yl)purine

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 80711,2-DimethoxyethaneSolvent

Procedure

Part G. A mixture of the boronic acid from Part F (298 mg, 1.67 mmol), 6-chloro-9-dicyclopropylmethyl-8-ethylpurine (309 mg, 1.12 mmol), 2 N aqueous sodium carbonate solution (1.7 mL, 3.4 mmol) and triphenylphosphine (61 mg, 0.233 mmol) in DME (20 mL) was degassed by repeated cycles of brief vacuum pumping followed by nitrogen purging. To this was added palladium (II) acetate (13 mg, 0.058 mmol), and the mixture was degassed again and then heated to reflux for 14 hours. It was cooled, and poured into water (100 mL). This mixture was extracted with ethyl acetate (2×100 mL), and the extracts were washed in sequence with brine (60 mL), combined, dried over sodium sulfate, filtered and evaporated. The residual material was separated by column chromatography (silica gel, 20:80 ethyl acetate-hexane) to afford the title product as a solid. This was recrystallized to purity from ether (253 mg, 0.77 mmol, 69%). m.p. 147-148° C. TLC RF 0.18 (30:70 ethyl acetate-hexane). 1H NMR (300 MHz, CDCl3): d 8.88 (1H, s), 7.60 (1H, s), 6.77 (1H, s), 4.61 (2H, t, J=8.6 Hz), 3.44 (1H, v br), 3.24 (2H, t, J=8.6 Hz), 2.94 (2H, br), 2.44 (3H, s), 2.03 (2H, v br), 1.45 (3H, br t, J=6 Hz), 0.89-0.79 (2H, m), 0.58 (2H, br), 0.50-0.40 (2H, m), 0.27-0.17 (2H, m). MS(NH3 -CI): m/e 377 (4), 376 (27), 375 (100). Analysis calc'd for C23H26N4O: C, 73.77; H, 7.01; N, 14.96; found: C, 73.69; H, 7.08; N, 14.40.

Workup

  1. customwas degassed by repeated cycles of brief vacuum
  2. customthe mixture was degassed again
  3. temperatureheated
  4. temperatureto reflux for 14 hours
  5. temperatureIt was cooled
  6. additionpoured into water (100 mL)
  7. extractionThis mixture was extracted with ethyl acetate (2×100 mL)
  8. washthe extracts were washed in sequence with brine (60 mL)
  9. dry with materialdried over sodium sulfate
  10. filtrationfiltered
  11. customevaporated
  12. customThe residual material was separated by column chromatography (silica gel, 20:80 ethyl acetate-hexane)

Sources & evidence

ORD record
ord-33d963ccd0614b3ea7f1eb52a5234aed
Source dataset
uspto-grants-2000_11
Patent number
US06143743

Reaction notes

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