Methanol → methyl 1-cyclopentyl-6-(4-hydroxyphenyl)-1H-indazole-4-carboxylate

HRID 1854123Notes

Reaction equation

HRID 1854123 reaction equation
Br[C:2]1[CH:3]=[C:4]([C:16]([O:18][CH3:19])=[O:17])[C:5]2[CH:6]=[N:7][N:8]([CH:11]3[CH2:15][CH2:14][CH2:13][CH2:12]3)[C:9]=2[CH:10]=1.[OH:20][C:21]1[CH:26]=[CH:25][C:24](B(O)O)=[CH:23][CH:22]=1.C([O-])([O-])=O.[Na+].[Na+].CO>O1CCOCC1.C(Cl)Cl.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH:11]1([N:8]2[C:9]3[CH:10]=[C:2]([C:24]4[CH:25]=[CH:26][C:21]([OH:20])=[CH:22][CH:23]=4)[CH:3]=[C:4]([C:16]([O:18][CH3:19])=[O:17])[C:5]=3[CH:6]=[N:7]2)[CH2:15][CH2:14][CH2:13][CH2:12]1

Participants

8

Reactant 4

HCID 887MethanolHCID 10340Sodium CarbonateHCID 27343604-Hydroxyphenylboronic acidHCID 67468180Methyl 6-bromo-1-cyclopentyl-1H-indazole-4-carboxylate

Product 1

HCID 136344377methyl 1-cyclopentyl-6-(4-hydroxyphenyl)-1H-indazole-4-carboxylateYield 71.1%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 6344DichloromethaneSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

A solution of methyl 6-bromo-1-cyclopentyl-1H-indazole-4-carboxylate (1.5 g, 4.6 mmol), (4-hydroxyphenyl)-boronic acid (0.768 g, 5.56 mmol) and Pd(PPh3)4 (0.536 g, 0.464 mmol) in 1,4-dioxane (15 mL) was purged with argon for 10 min. Then, 2 M Na2CO3 solution (1.77 g, 16.7 mmol) was added to it and again argon was purged through it for 10 min. The reaction mixture was stirred at 100° C. for 2 h. After completion of the reaction, water was added to it and extraction was carried out using 5% MeOH in DCM. The combined organic layers were washed with water, dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to afford crude material which was purified by column chromatography over silica gel to afford methyl 1-cyclopentyl-6-(4-hydroxyphenyl)-1H-indazole-4-carboxylate (1.1 g, 71%).

Workup

  1. customwas purged through it for 10 min
  2. customAfter completion of the reaction, water
  3. additionwas added to it and extraction
  4. washThe combined organic layers were washed with water
  5. dry with materialdried over anhydrous Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customto afford crude material which
  9. customwas purified by column chromatography over silica gel

Sources & evidence

ORD record
ord-abfecc4d49654310b62a7535f6a20d04
Source dataset
uspto-grants-2015_02
Patent number
US08962620B2

Reaction notes

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