Réaction #1256712

Équation de réaction

aluminum

10

4-(3,5-dimethyl-pyridin-4-yl)-3,5-dimethyl-phenylamine

nitrosonium tetrafluoroborate

NaI

Na2S2O3

→

title compound

Rendement 72.0%

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

Rendement 72.0%

Solvants

acetonitrile

acetonitrile

acetonitrile

Conditions de réaction

Traitement

1. 1
   Températureto gradually warm to room temperature
2. 2
   workup.STIRRINGstirred at room temperature overnight
3. 3
   Extractionextracted with chloroform (50 mL×3)
4. 4
   AutreThe organic layer was separated
5. 5
   Séchagedried over anhydrous Na2SO4
6. 6
   Filtrationfiltered
7. 7
   Concentrationconcentrated in vacuo
8. 8
   AutreThe crude product was purified by flash chromatography on silica gel
9. 9
   Lavageeluting with 8:1 chloroform

Mode opératoire

To a stirring suspension of nitrosonium tetrafluoroborate (0.876 g, 7.50 mmol) in dry acetonitrile (10 mL) was added dropwise via syringe a solution of 10 (0.904 g, 4.00 mmol) in dry acetonitrile (15 mL) under N2 at −30° C. The reaction mixture was next stirred at −30° C. for 1 h. To the resulting yellow solution was then added dropwise in the dark a solution of anhydrous NaI (1.125 g, 7.50 mmol) in dry acetonitrile (10 mL) under N2 at −30° C. The reaction mixture was covered with aluminum foil, allowed to gradually warm to room temperature, and stirred at room temperature overnight. The resulting red solution was next decolorized using an aqueous solution of Na2S2O3 and extracted with chloroform (50 mL×3). The organic layer was separated, dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by flash chromatography on silica gel, eluting with 8:1 chloroform: ethyl acetate, to give 0.96 g (72%) of the title compound as a yellow solid: mp 242-243° C.; 1H NMR (400 MHz, CDCl3): δ 8.397 (s, 2H), 7.520 (s, 2H), 1.908 (s, 6H), 1.838 (s, 6H); 13C NMR (100 MHz, CDCl3): δ 148.611, 147.520, 136.983, 136.774, 130.841, 93.681, 19.488, 16.758; MS(ESI): m/z 338.2[(M+H)+, 100]; Anal. Calcd. for C15H16IN: C, 53.43; H, 4.78; N, 4.15. Found; C, 52.91; H, 4.72; N, 4.07.

Source