تفاعل #356752

معادلة التفاعل

Ethyl 6-{5′-chloro-2′-[(phenylmethyl)oxy]-2-biphenylyl}-2-pyridinecarboxylate

hydrogen bromide

→

colourless gum

المردود 82.3%

Ethyl 6-(5′-chloro-2′-hydroxy-2-biphenylyl)-2-pyridinecarboxylate

المردود 82.3%

المذيبات

acetic acid

diethyl ether water

potassium carbonate

acetic acid

ظروف التفاعل

المعالجة

1. 1
   أخرىThe organic phase was separated
2. 2
   تجفيفdried (magnesium sulphate)
3. 3
   أخرىevaporated
4. 4
   أخرىchromatographed on silica eluting with ethyl acetate/iso-hexane (1:3)
5. 5
   workup.DISSOLUTIONThe product was dissolved in ethanol (20 ml)
6. 6
   workup.ADDITION60% sodium hydride (2 mg) added
7. 7
   workup.ADDITIONdiluted with water/ether
8. 8
   غسيلthe organic phase washed with saturated sodium bicarbonate solution
9. 9
   تجفيفdried (magnesium sulphate)
10. 10
    أخرىevaporated
11. 11
    أخرىchromatographed on silica

الإجراء التجريبي

Ethyl 6-{5′-chloro-2′-[(phenylmethyl)oxy]-2-biphenylyl}-2-pyridinecarboxylate (1.22 g, 2.75 mmol) was dissolved in acetic acid (5 ml) and 48% hydrogen bromide in acetic acid (5 ml), left at room temperature for 0.5 hours then diluted with diethyl ether/water and basified with potassium carbonate. The organic phase was separated, dried (magnesium sulphate), evaporated and chromatographed on silica eluting with ethyl acetate/iso-hexane (1:3). The product was dissolved in ethanol (20 ml), 60% sodium hydride (2 mg) added and the solution left at room temperature for 16 hours. The resulting solution was acidified with acetic acid, diluted with water/ether and the organic phase washed with saturated sodium bicarbonate solution, dried (magnesium sulphate), evaporated and chromatographed on silica to give 801 mg of colourless gum. LC/MS t=3.33, [MH+] 354.3, 356.3

المصدر