Реакция #2146757

Уравнение реакции

triethyl amine

aluminum

4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidine

trimethylsilylacetylene

→

4-chloro-5-trimethylsilylethynyl-7H-pyrrolo[2,3-d]pyrimidine

Растворители

DMF

THF

Условия реакции

Обработка

1. 1
   ДругоеTo a 250 ml round-bottomed flask, protected
2. 2
   ДругоеThe solvent is removed in vacuo
3. 3
   workup.DISSOLUTIONthe residue is dissolved in methylene chloride (250 ml)
4. 4
   ПромывкаThe reaction mixture is washed with water (3×50 ml)
5. 5
   Сушкаthe combined organic layer is dried over Na2SO4
6. 6
   Концентрированиеconcentrated in vacuo
7. 7
   ДругоеThe crude residue is purified by flash-chromatography on silica gel
8. 8
   Промывкаeluted with 70% EtOAc in cyclohexane
9. 9
   workup.ADDITIONFractions containing the desired product (TLC)
10. 10
    Другоеevaporated

Методика

To a 250 ml round-bottomed flask, protected from light with aluminum foil, are added 4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidine (1.3 g, 4.6 mmol), copper(I) iodide (0.17 g, 0.93 mmol), trimethylsilylacetylene (0.96 ml, 6.97 mmol), and tetrakis(triphenylphosphine)palladium(0) (0.26 g, 0.23 mmol) dissolved in anhydrous THF (60 ml), anhydrous DMF (20 ml) and triethyl amine (0.64 ml, 4.65 mmol). The reaction mixture is stirred at room temperature under nitrogen for 16 hrs. The solvent is removed in vacuo, and the residue is dissolved in methylene chloride (250 ml). The reaction mixture is washed with water (3×50 ml), and the combined organic layer is dried over Na2SO4, and concentrated in vacuo. The crude residue is purified by flash-chromatography on silica gel and eluted with 70% EtOAc in cyclohexane. Fractions containing the desired product (TLC) are pooled and evaporated to afford 4-chloro-5-trimethylsilylethynyl-7H-pyrrolo[2,3-d]pyrimidine as a tan white solid.

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