Pyridine → 6-(2,2-Diphenyl-ethylamino)-9-((1R,4S)-4-ethoxycarbonyloxy-cyclopent-2-enyl)-9H-purine-2-carboxylic acid methyl ester

HRID 1882581Notes

Reaction equation

HRID 1882581 reaction equation
[CH3:1][O:2][C:3]([C:5]1[N:13]=[C:12]2[C:8]([N:9]=[CH:10][N:11]2[C@@H:14]2[CH2:18][C@H:17]([OH:19])[CH:16]=[CH:15]2)=[C:7]([NH:20][CH2:21][CH:22]([C:29]2[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=2)[C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[N:6]=1)=[O:4].N1C=CC=CC=1.Cl[C:42]([O:44][CH2:45][CH3:46])=[O:43]>O1CCCC1>[CH3:1][O:2][C:3]([C:5]1[N:13]=[C:12]2[C:8]([N:9]=[CH:10][N:11]2[C@@H:14]2[CH2:18][C@H:17]([O:19][C:42]([O:44][CH2:45][CH3:46])=[O:43])[CH:16]=[CH:15]2)=[C:7]([NH:20][CH2:21][CH:22]([C:29]2[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=2)[C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[N:6]=1)=[O:4]

Participants

5

Reactant 3

HCID 1049PyridineHCID 10928Ethyl chloroformateHCID 666305706-(2,2-Diphenyl-ethylamino)-9-((1R,4S)-4-hydroxy-cyclopent-2-enyl)-9H-purine-2-carboxylic acid methyl ester

Product 1

HCID 666310616-(2,2-Diphenyl-ethylamino)-9-((1R,4S)-4-ethoxycarbonyloxy-cyclopent-2-enyl)-9H-purine-2-carboxylic acid methyl ester

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

6-(2,2-Diphenyl-ethylamino)-9-((1R,4S)-4-hydroxy-cyclopent-2-enyl)-9H-purine-2-carboxylic acid methyl ester (2.80 g, 6.14 mmol) is placed in an oven-dried flask under an atmosphere of argon. Dry tetrahydrofuran (30 ml) is added followed by dry pyridine (0.97 g, 12.3 mmol). Ethyl chloroformate (2.66 g, 24.6 mmol) is added slowly and the reaction mixture is stirred at room temperature. The reaction is shown to be complete by LCMS after 3 hours. The solvent is removed in vacuo and the residue is partitioned between dichloromethane (200 ml) and 1M HCl (2×200 ml). The organic layer is washed with water (2×100 ml) and brine (2×100 ml), dried over MgSO4, filtered and the solvent is removed in vacuo. The title compound is obtained after purification by flash column chromatography (silica, 4% MeOH in dichloromethane). MS (ES+) m/e 528.3 (MH+).

Workup

  1. customThe solvent is removed in vacuo
  2. customthe residue is partitioned between dichloromethane (200 ml) and 1M HCl (2×200 ml)
  3. washThe organic layer is washed with water (2×100 ml) and brine (2×100 ml)
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. customthe solvent is removed in vacuo

Sources & evidence

ORD record
ord-8f12b970ccf945bc8fcd7b4579649501
Source dataset
uspto-grants-2012_11
Patent number
US08318750B2

Reaction notes

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