Reaktion #1097676

Reaktionsgleichung

dichloromethane

tert-butyl 4-[(trifluoromethyl)sulfonyl]oxy-3,6-dihydropyridine-1(2H)-carboxylate

2,6-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol

potassium carbonate

N,N-dimethylformamide

→

desired product

Ausbeute 82.1%

tert-butyl 4-(4-hydroxy-3,5-dimethylphenyl)-3,6-dihydropyridine-1(2H)-carboxylate

Ausbeute 82.1%

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter quenched with water
2. 2
   Extraktionextracted with ethyl acetate
3. 3
   WaschenThe combined organic layers were washed with water, brine
4. 4
   Sonstigedried
5. 5
   Sonstigeevaporated
6. 6
   Sonstigeto dry
7. 7
   Wascheneluting with 0 to 50% EtOAc in hexane

Vorschrift

Nitrogen was bubbled through a mixture of tert-butyl 4-[(trifluoromethyl)sulfonyl]oxy-3,6-dihydropyridine-1(2H)-carboxylate (5.80 g, 0.0175 mol), 2,6-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol (4.82 g, 0.0194 mol) and potassium carbonate (7.26 g, 0.0525 mol) in N,N-dimethylformamide (50.0 mL, 0.646 mol) for 10 min. To the reaction mixture was then added [1,1′-Bis(diphenylphosphino)ferrocene]-dichloropalladium(II),complex with dichloromethane (1:1) (0.8 g, 0.001 mol). The resultant mixture was heated at 80 Celsius overnight. After quenched with water, the mixture was neutralized with 1N HCl, extracted with ethyl acetate. The combined organic layers were washed with water, brine, dried and evaporated to dry. The residue was applied on column, eluting with 0 to 50% EtOAc in hexane, to yield the desired product (4.36 g, 82.09%). MS (ESI): (M-Boc+2) 204.0.

Quelle