3-Cyclopentyloxy-4-methoxybenzaldehyde → HCID 178491044, compound

HRID 1871525Notes

Reaction equation

HRID 1871525 reaction equation
[NH2:1][C:2]1[C:6]([C:7]([OH:9])=[O:8])=[CH:5][NH:4][N:3]=1.[CH:10]1([O:15][C:16]2[CH:17]=[C:18]([CH:21]=[CH:22][C:23]=2[O:24][CH3:25])[CH:19]=O)[CH2:14][CH2:13][CH2:12][CH2:11]1.C([BH3-])#N.[Na+]>CO>[CH:10]1([O:15][C:16]2[CH:17]=[C:18]([CH:21]=[CH:22][C:23]=2[O:24][CH3:25])[CH2:19][NH:1][C:2]2[C:6]([C:7]([OH:9])=[O:8])=[CH:5][NH:4][N:3]=2)[CH2:11][CH2:12][CH2:13][CH2:14]1

Participants

5

Reactant 3

HCID 27358933-Cyclopentyloxy-4-methoxybenzaldehydeHCID 5003444Sodium cyanoborohydrideHCID 178509273HCID 178509273, compound

Product 1

HCID 178491044HCID 178491044, compoundYield 48.7%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A suspension of 3-amino-4-pyrazole carboxylic acid (3.56 g, 28 mmol) in 400 ml of methanol and 3-cyclopentyloxy-4-methoxybenzaldehyde (5.06 g, 23 mmol) was stirred at room temperature for 16 hours with sodium cyanoborohydride, 1.85 g (95% pure, 28 mmol). The methanol was evaporated under reduced pressure and the residue was taken up in 100 ml of 15% sodium hydroxide and extracted twice with 100 ml portions of ether. The aqueous layer was acidified to pH 5 with 5 N hydrochloric acid and extracted twice with 100 ml portions of ethyl acetate. The ethyl acetate was dried over sodium sulfate and evaporated. The residue was triturated with ether to give 3.7 g of 3-(3-cyclopentyloxy-4-methoxybenzylamino)-4-pyrazolecarboxylic acid (48.7%). Pure 3-(3-cyclopentyloxy-4-methoxybenzylamino)pyrazole carboxylic acid shows mp. 134-136° C. after crystallization from methanol.

Workup

  1. customThe methanol was evaporated under reduced pressure
  2. extractionextracted twice with 100 ml portions of ether
  3. extractionextracted twice with 100 ml portions of ethyl acetate
  4. dry with materialThe ethyl acetate was dried over sodium sulfate
  5. customevaporated
  6. customThe residue was triturated with ether

Sources & evidence

ORD record
ord-5a3ba926bb8549af95d78d6dab394303
Source dataset
uspto-grants-2000_08
Patent number
US06103749

Reaction notes

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