Реакция #1256716

Уравнение реакции

HCl

NaH

malononitrile

11

4-(4-iodo-2,6-dimethyl-phenyl)-3,5-dimethyl-pyridine

→

title compound

Выход 95.5%

2-[4-(3,5-dimethyl-pyridin-4-yl)-3,5-dimethyl-phenyl]-malononitrile

Выход 95.5%

Растворители

1,2-dimethoxyethane

1,2-dimethoxyethane

Условия реакции

Обработка

1. 1
   workup.STIRRINGThe reaction mixture was next stirred at 85° C. under N2 for 5 h
2. 2
   ДругоеThe solvent was then removed under reduced pressure
3. 3
   ПромывкаThe resulting solid was washed with benzene (20 mL)
4. 4
   workup.DISSOLUTIONdissolved in water
5. 5
   Фильтрацияfiltered
6. 6
   Другоеto give a dark-yellow aqueous solution
7. 7
   Фильтрацияthe resulting yellow precipitate was collected by filtration
8. 8
   Другоеto give an orange solid
9. 9
   ДругоеThe crude product was purified by flash chromatography on silica gel eluting with 1:1 hexane

Методика

To an ice-cooled suspension of NaH (0.12 g, 5.0 mmol) in anhydrous 1,2-dimethoxyethane (8 mL) was added dropwise via syringe a solution of malononitrile (0.165 g, 2.50 mmol) in anhydrous 1,2-dimethoxyethane (2 mL) under N2. The mixture was stirred for 1 h at room temperature under N2. Next, 11 (0.674 g, 2.00 mmol) and tetrakis(triphenyphophine)palladium(0) (0.232 g, 0.200 mmol) were added to the resulting pink suspension under an N2 flow. The reaction mixture was next stirred at 85° C. under N2 for 5 h. The solvent was then removed under reduced pressure. The resulting solid was washed with benzene (20 mL), dissolved in water, and filtered to give a dark-yellow aqueous solution. This solution was neutralized with 5% HCl to pH=7, and the resulting yellow precipitate was collected by filtration to give an orange solid. The crude product was purified by flash chromatography on silica gel eluting with 1:1 hexane: ethyl acetate, to give 0.525 g (95.5%) of the title compound as red solid: mp 58-60° C.; 1H NMR (400 MHz, CDCl3): δ 8.412 (s, 2H), 7.286 (s, 2H), 5.100 (s, 1H), 1.946 (s, 6H), 1.895 (s, 6H); 13C NMR (100 MHz, CDCl3): δ 149.066, 146.564, 139.513, 137.283, 130.441, 126.692, 125.518, 112.024,28.059, 19.988, 16.704; Anal. Calcd. for C18H17N3·H2O: C, 73.69; H, 6.53; N, 14.32. Found; C, 73.36; H, 6.35; N, 14.07.

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