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

HRID 61502

Reaktionsgleichung

Reaktionsgleichung von HRID 61502
FC(F)(F)S(O[C:7]1[CH2:8][CH2:9][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:11][CH:12]=1)(=O)=O.[CH3:22][C:23]1[CH:28]=[C:27](B2OC(C)(C)C(C)(C)O2)[CH:26]=[C:25]([CH3:38])[C:24]=1[OH:39].C(=O)([O-])[O-].[K+].[K+].CN(C)C=O.ClCCl>>[OH:39][C:24]1[C:25]([CH3:38])=[CH:26][C:27]([C:7]2[CH2:8][CH2:9][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:11][CH:12]=2)=[CH:28][C:23]=1[CH3:22]

Komponenten

6

Edukt 5

HCID 6228DimethylformamideHCID 6344DichloromethaneHCID 11430Potassium CarbonateHCID 27346492,6-Dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenolHCID 10991161Tert-butyl 4-(trifluoromethanesulfonyloxy)-1,2,3,6-tetrahydropyridine-1-carboxylate

Produkt 1

HCID 67304025Tert-butyl 4-(4-hydroxy-3,5-dimethylphenyl)-3,6-dihydropyridine-1(2H)-carboxylateAusbeute 82,1 %

Versuchsvorschrift

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, F-Bis(diphenylphosphino)ferrocene]-dichloropalladium(II), complex with dichloromethane (1:1) (0.8 g, 0.001 mol). The resultant mixture was heated at 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.

Aufarbeitung

  1. customAfter quenched with water
  2. extractionextracted with ethyl acetate
  3. washThe combined organic layers were washed with water, brine
  4. customdried
  5. customevaporated
  6. customto dry
  7. washeluting with 0 to 50% EtOAc in hexane

Quellen und Nachweise

ORD-Eintrag
ord-bcefad59c14243948d4f4c0c44e54e3c
Quelldatensatz
uspto-grants-2016_09
Patentnummer
US09440958B2

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