Reaktion #1256706

Reaktionsgleichung

3

4-(4-methoxy-2,6-dimethyl-phenyl)-3,5-dimethyl-pyridin-1-ol

sodium hypophosphite hydrate

→

title compound

Ausbeute 97.9%

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

Ausbeute 97.9%

Lösungsmittel

acetic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   Filtrationfiltered
2. 2
   Einengenconcentrated in vacuo
3. 3
   workup.DISSOLUTIONThe resulting light-yellow oil was dissolved in chloroform (250 mL)
4. 4
   Waschenwashed successively with saturated NaHCO3 (aq.), water, and brine
5. 5
   SonstigeThe organic layer was then separated
6. 6
   Trocknendried over MgSO4
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated in vacuo
9. 9
   SonstigeThe resulting pale-yellow solid was purified by flash chromatography on silica gel eluting with 1:1 hexane

Vorschrift

To a mixture of 3 (6.55 g, 25.5 mmol) and palladium (10 wt. % on activated carbon; 3.05 g, 2.8 mmol) in acetic acid (150 mL) was added sodium hypophosphite hydrate (6.7 g, 63 mmol) in a single portion at 80° C. The reaction mixture was stirred at 80° C. under N2 for 12 h, then filtered and concentrated in vacuo. The resulting light-yellow oil was dissolved in chloroform (250 mL) and washed successively with saturated NaHCO3 (aq.), water, and brine. The organic layer was then separated, dried over MgSO4, filtered, and concentrated in vacuo. The resulting pale-yellow solid was purified by flash chromatography on silica gel eluting with 1:1 hexane: ethyl acetate, to give 6.01 g (97.9%) of the title compound as colorless solid: mp 87-88° C.; 1H NMR (400 MHz, CD2Cl2): δ 8.334 (s, 2H), 6.707 (s, 2H), 3.804 (s, 3H), 1.892 (s, 6H), 1.851 (s, 6H); 13C NMR (100 MHz, CD2Cl2): δ 159.330, 148.939, 148.420, 136.373, 131.905, 129.958, 113.489, 55.556, 20.188, 16.831; MS (APCI): m/z 242.2 [(M+H)+, 100]; Anal. Calcd. For C16H19NO: C, 79.63; H, 7.94; N, 5.80. Found: C, 79.39; H, 7.94; N, 5.75.

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