Реакция #52142

Уравнение реакции

(2-iodo-3,4,5-trimethoxyphenyl) diphenylphosphine oxide

(2-iodo-3,4,5-trimethoxyphenyl)diphenylphosphine oxide

phenylboronic acid

→

product 22

Выход 98.0%

(2-phenyl-3,4,5-trimethoxyphenyl)diphenylphosphine oxide

Выход 98.0%

Условия реакции

Обработка

1. 1
   Другоеdegassed THF (800 ml)
2. 2
   workup.ADDITIONA solution of degassed saturated K2CO3 (400 ml) was added afterwards
3. 3
   ДругоеThe whole mixture was degassed with nitrogen for an additional 10 min
4. 4
   Температураat reflux under nitrogen for 24 hrs
5. 5
   КонцентрированиеThe reaction mixture was concentrated under reduced pressure
6. 6
   Другоеto remove THF and 400 ml of CH2Cl2
7. 7
   workup.ADDITIONwas then added
8. 8
   ПромывкаThe CH2Cl2 layer was washed with water (200 ml) and brine (200 ml)
9. 9
   Сушкаdried over Na2SO4
10. 10
    Другоеevaporated
11. 11
    ДругоеThe solid residue was recrystallized from EtOAc (100 ml)

Методика

To a 2 liter Schlenk flask was added (2-iodo-3,4,5-trimethoxyphenyl) diphenylphosphine oxide 21 (30 g, 61 mmol), phenylboronic acid (11.1 g, 91 mmol), and degassed THF (800 ml). A solution of degassed saturated K2CO3 (400 ml) was added afterwards. The whole mixture was degassed with nitrogen for an additional 10 min. Then, Pd(PPh3)4 (1.22 mmol, 1.4 g) was added in the solution through one portion. The mixture was stirred at reflux under nitrogen for 24 hrs. In situ 31PNMR showed that the reaction was complete. The reaction mixture was concentrated under reduced pressure to remove THF and 400 ml of CH2Cl2 was then added. The CH2Cl2 layer was washed with water (200 ml) and brine (200 ml), dried over Na2SO4, and evaporated. The solid residue was recrystallized from EtOAc (100 ml) to give off-white product 22 (23 g). The mother liquid was passed though a silica gel column to give another 4 g of product 22. The total yield was 98%.

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