تفاعل #57536

معادلة التفاعل

(6-Bromo-pyridin-2-yl)-methanol

triethylamine

potassium cyanide

18-crown-6

methanesulfonyl chloride

→

(6-Bromo-pyridin-2-yl)-acetonitrile

المردود 59.0%

المذيبات

N,N-dimethylformamide

Water

ظروف التفاعل

المعالجة

1. 1
   استخلاصthe entire mixture was extracted with a mixture of 1:1 AcOEt/Hexanes
2. 2
   تجفيفThe combined organic extracts were dried over magnesium sulfate
3. 3
   تركيزconcentrated in vacuo
4. 4
   workup.DISSOLUTIONThe crude material (23400 mg) was dissolved in acetonitrile (50 mL)
5. 5
   درجة الحرارةThe mixture was heated
6. 6
   درجة الحرارةat reflux for 5 h
7. 7
   أخرىThe volatiles were removed under reduced pressure
8. 8
   workup.DISSOLUTIONthe crude material was dissolved in AcOEt
9. 9
   غسيلwashed with a saturated aqueous sodium bicarbonate solution
10. 10
    تجفيفThe organic layer was dried over magnesium sulfate
11. 11
    أخرىthe solvents were removed under reduced pressure
12. 12
    أخرىThe crude residue was purified by column chromatography
13. 13
    غسيلeluted with a gradient of 10 to 60% AcOEt/hexanes

الإجراء التجريبي

To a solution of (6-Bromo-pyridin-2-yl)-methanol (20.0 g, 106.37 mmol) in N,N-dimethylformamide (200 mL) at 0° C. was added triethylamine (22.2 mL, 159.55 mmol) followed by methanesulfonyl chloride (9.24 mL, 117.01 mmol). The reaction was allowed to stand for 3 hours at which time the reaction was deemed complete. Water was added to the mixture and the entire mixture was extracted with a mixture of 1:1 AcOEt/Hexanes. The combined organic extracts were dried over magnesium sulfate and concentrated in vacuo. The crude material (23400 mg) was dissolved in acetonitrile (50 mL) and potassium cyanide (8311 mg, 127.64 mmol) and 18-crown-6 (14057 mg, 53.18 mmol) were added to the solution. The mixture was heated at reflux for 5 h then cooled to room temperature. The volatiles were removed under reduced pressure and the crude material was dissolved in AcOEt and washed with a saturated aqueous sodium bicarbonate solution. The organic layer was dried over magnesium sulfate and the solvents were removed under reduced pressure. The crude residue was purified by column chromatography eluted with a gradient of 10 to 60% AcOEt/hexanes to give (6-Bromo-pyridin-2-yl)-acetonitrile as a brown solid (12290 mg, 59%). MS ES (MH+197.1/199.1).

المصدر