Sodium borohydride → HCID 10294562, compound

HRID 861243Notes

Reaction equation

HRID 861243 reaction equation
[C:1]([C:3]1[C:4]([C:25]([F:28])([F:27])[F:26])=[N:5][N:6]([C:13]2[C:18]([Cl:19])=[CH:17][C:16]([C:20]([F:23])([F:22])[F:21])=[CH:15][C:14]=2[Cl:24])[C:7]=1[N:8]=[CH:9]OCC)#[N:2].[BH4-].[Na+]>CO>[C:1]([C:3]1[C:4]([C:25]([F:27])([F:28])[F:26])=[N:5][N:6]([C:13]2[C:14]([Cl:24])=[CH:15][C:16]([C:20]([F:22])([F:21])[F:23])=[CH:17][C:18]=2[Cl:19])[C:7]=1[NH:8][CH3:9])#[N:2]

Participants

4

Reactant 2

HCID 4311764Sodium borohydride2×HCID 53786085HCID 53786085, compound

Product 1

HCID 10294562HCID 10294562, compound

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a suspension of 4-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-ethoxymethyleneamino-3-trifluoromethylpyrazole (1.0 g) in methanol (10 ml) stirred at room temperature was added sodium borohydride (0.17 g). After 2 hours an additional 0.17 g of sodium borohydride was added, and another 0.34 g added after 1 hours. One hour later the mixture was poured onto water (80 ml). The combined extracts were dried over anhydrous magnesium sulphate, filtered, and evaporated in vacuo. The white solid thus obtained was purified by chromatography on silica (Merck, 230-400 mesh, 0.7 kg cm-2) with dichloromethane as eluent, to furnish 4-cyano-5-methylamino-1-(2,6-dichloro-4-trifluoromethylphenyl)-3-trifluoromethylpyrazole as a white solid )0.6 g), m.p. 200°-202° C.

Workup

  1. additionanother 0.34 g added after 1 hours
  2. additionOne hour later the mixture was poured onto water (80 ml)
  3. dry with materialThe combined extracts were dried over anhydrous magnesium sulphate
  4. filtrationfiltered
  5. customevaporated in vacuo
  6. customThe white solid thus obtained
  7. customwas purified by chromatography on silica (Merck, 230-400 mesh, 0.7 kg cm-2) with dichloromethane as eluent

Sources & evidence

ORD record
ord-6398df4b43b5439f86cb8ad8ab0da47f
Source dataset
uspto-grants-1998_02
Patent number
US05714191

Reaction notes

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