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

HRID 1726704Notes

Reaction equation

HRID 1726704 reaction equation
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>Cl[Pd]Cl.C1(P(C2C=CC=CC=2)[C-]2C=CC=C2)C=CC=CC=1.[C-]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C1.[Fe+2]>[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]

Participants

7

Reactant 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

Product 1

HCID 67304025Tert-butyl 4-(4-hydroxy-3,5-dimethylphenyl)-3,6-dihydropyridine-1(2H)-carboxylateYield 82.1%

Reagents, catalysts & solvents 1

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)Catalyst

Procedure

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 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 coloumn, 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.

Workup

  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

Sources & evidence

ORD record
ord-e6de2d37b0ce4594857db1e853cdfcb1
Source dataset
uspto-grants-2009_02
Patent number
US07491724B2

Reaction notes

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