Реакция #72959

Уравнение реакции

iodoethane

2-[4-(1-tritylpyrazolo[5,4-b]pyridin-4-yl)pyrazol-1-yl]acetonitrile

diisopropylamine

butyllithium

→

product

Выход 57.2%

2-(4-(1H-pyrazolo[3,4-b]pyridin-4-yl)-1H-pyrazol-1-yl)butanenitrile

Выход 57.2%

Растворители

THF

Условия реакции

Обработка

1. 1
   Другоеthe ice bath removed
2. 2
   workup.ADDITIONtreated with brine/EtOAc
3. 3
   Другоеthe two layers separated
4. 4
   СушкаThe organics were dried (MgSO4)
5. 5
   Фильтрацияfiltered
6. 6
   Концентрированиеconcentrated
7. 7
   workup.ADDITIONtreated with triethylsilane (4 mL) and TFA (0.5 mL)
8. 8
   workup.STIRRINGto stir at RT for 2 hours
9. 9
   КонцентрированиеThe reaction was concentrated in vacuo
10. 10
    Другоеpurified by column chromatography (10% MeOH/DCM)

Методика

A solution of diisopropylamine (229.8 mg, 318.3 μL, 2.271 mmol) in THF (10 mL) at 0° C. was treated with butyllithium (698.8 μL of 2.5 M, 1.747 mmol) and then allowed to cool to −78° C. This was then added dropwise to a solution of 2-[4-(1-tritylpyrazolo[5,4-b]pyridin-4-yl)pyrazol-1-yl]acetonitrile (815 mg, 1.747 mmol) over a period of 20 minutes. After a further 30 minutes the reaction was treated with iodoethane (544.9 mg, 279.4 μL, 3.494 mmol) at −78° C. and the ice bath removed. The reaction was allowed to stir for 1.5 hours and then treated with brine/EtOAc and the two layers separated. The organics were dried (MgSO4), filtered and concentrated. The resultant residue was taken up in DCM (12 mL) and treated with triethylsilane (4 mL) and TFA (0.5 mL) and allowed to stir at RT for 2 hours. The reaction was concentrated in vacuo and purified by column chromatography (10% MeOH/DCM) to give the product as a pure white solid (252 mg, 57% Yield). 1H NMR (DMSO, 400 MHz) δ 0.95 (3H, t), 2.23-2.28 (2H, m), 5.79 (1H, t), 7.46 (1H, d), 8.46 (1H, s), 8.48 (1H, d), 8.52 (1H, d), 8.83 (1H, s), 13.73 (1H, br s); MS (ES+) 253.09

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