Reaction #1256716

Reaction equation

HCl

NaH

malononitrile

11

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

→

title compound

Yield 95.5%

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

Yield 95.5%

Solvents

1,2-dimethoxyethane

1,2-dimethoxyethane

Conditions

Workup

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

Procedure

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.

Source