Pyridine → ethyl 3-methyl-1-(6-methoxy-2-naphthyl)-1H-pyrazole-5-carboxylate

HRID 987504Notes

Reaction equation

HRID 987504 reaction equation
B(O)O.[CH3:4][C:5]1[CH:9]=[C:8]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[NH:7][N:6]=1.N1C=CC=CC=1.CC1N([C:27]2[CH:36]=[CH:35][C:34]3[C:29](=[CH:30][CH:31]=[C:32]([O:37][CH3:38])[CH:33]=3)[CH:28]=2)N=C(C(OCC)=O)C=1>C(Cl)Cl.C([O-])(=O)C.[Cu+2].C([O-])(=O)C>[CH3:4][C:5]1[CH:9]=[C:8]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[N:7]([C:27]2[CH:36]=[CH:35][C:34]3[C:29](=[CH:30][CH:31]=[C:32]([O:37][CH3:38])[CH:33]=3)[CH:28]=2)[N:6]=1

Participants

7

Reactant 4

HCID 1049PyridineHCID 61668Boronic AcidHCID 22728899ethyl 5-methyl-1-(6-methoxy-2-naphthyl)-1H-pyrazole-3-carboxylateHCID 178469061HCID 178469061, compound

Product 1

HCID 22728868ethyl 3-methyl-1-(6-methoxy-2-naphthyl)-1H-pyrazole-5-carboxylateYield 37%

Reagents, catalysts & solvents 2

HCID 8895Cupric acetateCatalystHCID 6344DichloromethaneSolvent2×

Procedure

To a solution of the above-prepared boronic acid (0.84 g, 3.2 mmol) and ethyl 3-methylpyrazole-5-carboxylate (0.49 g, 3.2 mmol) in 20 mL dry DCM were added pyridine (0.77 mL, 9.5 mmol) and anhydrous powder of copper(II) acetate (1.15 g, 6.3 mmol). Some activated molecular sieve powder was added afterwards. The resulting slurry was stirred for 4 days under argon. The mixture was diluted with DCM. It was filtered through celite. The blue filtrate was washed with water (×2), dried, concentrated and purified by flash column to separately afford ethyl 3-methyl-1-(6-methoxy-2-naphthyl)-1H-pyrazole-5-carboxylate [37% yield. Rf 0.80 (1:1 EtOAc:hexane). ES-MS: (M+H)+311] and ethyl 5-methyl-1-(6-methoxy-2-naphthyl)-1H-pyrazole-3-carboxylate [25% yield. Rf 0.69 (1:1 EtOAc:hexane). ES-MS: (M+H)+311]in a 1.5:1 ratio.

Workup

  1. additionSome activated molecular sieve powder was added afterwards
  2. filtrationIt was filtered through celite
  3. washThe blue filtrate was washed with water (×2)
  4. customdried
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-71e42d9500d4421b9837bee9dae375c4
Source dataset
uspto-grants-2003_10
Patent number
US06632815B2

Reaction notes

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