تفاعل #69982

معادلة التفاعل

4,5-bis(diphenylphosphino)-9,9-dimethylxanthene

sodium tert-butoxide

1-bromo-4-iodobenzene

4-(piperidin-4-yloxy)pyridine

→

4-[1-(4-bromophenyl)piperidin-4-yloxy]pyridine

المردود 50.9%

المذيبات

Ethyl acetate

toluene

ظروف التفاعل

المعالجة

1. 1
   غسيلthe mixture is washed twice with water and once with a saturated aqueous sodium chloride solution
2. 2
   تجفيفThe organic phase is dried over magnesium sulphate
3. 3
   تركيزconcentrated under reduced pressure
4. 4
   أخرىThe crude product obtained
5. 5
   أخرىis chromatographed on silica gel, elution

الإجراء التجريبي

2 g of 1-bromo-4-iodobenzene and 1.386 g of 4-(piperidin-4-yloxy)pyridine are placed in 35 ml of toluene and then 0.324 g of tris(dibenzylideneacetone)dipalladium(0), 0.245 g of 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene and 1.019 g of sodium tert-butoxide are added. The reaction medium is heated at 110° C. for 18 h. Ethyl acetate is subsequently added and the mixture is washed twice with water and once with a saturated aqueous sodium chloride solution. The organic phase is dried over magnesium sulphate and concentrated under reduced pressure. The crude product obtained is chromatographed on silica gel, elution being carried out with a gradient of a dichloromethane/methanol (99/1 to 98/2) mixture. 1.2 g of 4-[1-(4-bromophenyl)piperidin-4-yloxy]pyridine are obtained.

المصدر