Sodium Bicarbonate → HCID 178433828, compound

HRID 384361Notes

Reaction equation

HRID 384361 reaction equation
Br.[NH2:2][C:3]1[C:4]([OH:18])=[C:5]([C:10]2[S:14][C:13]([C:15]([OH:17])=[O:16])=[CH:12][CH:11]=2)[CH:6]=[C:7]([CH3:9])[CH:8]=1.[N:19]([O-])=O.[Na+].[CH3:23][C:24]1[CH2:25][C:26](=[O:39])[N:27]([C:29]2[CH:38]=[CH:37][C:36]3[CH2:35][CH2:34][CH2:33][CH2:32][C:31]=3[CH:30]=2)[N:28]=1.C(=O)(O)[O-].[Na+]>Cl.C(O)C>[OH:18][C:4]1[C:3]([NH:2][N:19]=[C:25]2[C:26](=[O:39])[N:27]([C:29]3[CH:38]=[CH:37][C:36]4[CH2:35][CH2:34][CH2:33][CH2:32][C:31]=4[CH:30]=3)[N:28]=[C:24]2[CH3:23])=[CH:8][C:7]([CH3:9])=[CH:6][C:5]=1[C:10]1[S:14][C:13]([C:15]([OH:17])=[O:16])=[CH:12][CH:11]=1

Participants

7

Reactant 4

HCID 516892Sodium BicarbonateHCID 23668193Sodium NitriteHCID 510365803-Methyl-1-(5,6,7,8-tetrahydronaphthalen-2-yl)-1H-pyrazol-5(4H)-oneHCID 574838215-(3-Amino-2-hydroxy-5-methyl-phenyl)-thiophene-2-carboxylic acid hydrobromide

Product 1

HCID 178433828HCID 178433828, compoundYield 18.09%

Reagents, catalysts & solvents 2

HCID 313Hydrochloric AcidSolventHCID 702EthanolSolvent

Procedure

5-(3-Amino-2-hydroxy-5-methyl-phenyl)-thiophene-2-carboxylic acid hydrobromide 24d (366 mg, 1.11 mmol) was dissolved in 3.7 mL of 1 N hydrochloric acid upon cooling by an ice-water bath, followed by dropwise addition of 1.5 mL of aqueous sodium nitrite (85 mg, 1.22 mmol). After the mixture was reacted for 20 minutes, 5-methyl-2-(5,6,7,8-tetrahydro-naphthalen-2-yl)-2,4-dihydro-pyrazol-3-one 3i (228 mg, 1 mmol), sodium bicarbonate (1.4 g, 16.67 mmol) and 2 mL of ethanol were added successively. The reaction mixture was reacted overnight at room temperature. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was filtered and the filter cake was added to 30 mL of water. The mixture was adjusted to pH 3˜4 with concentrated hydrochloric acid. The mixture was filtered and the filter cake was dried and purified by silica gel column chromatography to obtain the title compound 5-(2-hydroxy-5-methyl-3-{N′-[3-methyl-5-oxo-1-(5,6,7,8-tetrahydro-naphthalen-2-yl)-1,5-dihydro-pyrazol-4-ylidene]-hydrazino}-phenyl)-thiophene-2-carboxylic acid 33 (88 mg, yield 18.09%) as a red solid.

Workup

  1. temperatureupon cooling by an ice-water bath
  2. customAfter the mixture was reacted for 20 minutes
  3. customThe reaction mixture was reacted overnight at room temperature
  4. filtrationThe mixture was filtered
  5. additionthe filter cake was added to 30 mL of water
  6. filtrationThe mixture was filtered
  7. customthe filter cake was dried
  8. custompurified by silica gel column chromatography

Sources & evidence

ORD record
ord-6c3f0dadba754edbb526fbb9d14f4a2e
Source dataset
uspto-grants-2013_02
Patent number
US08367710B2

Reaction notes

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