1-Benzoyl-2-isopropylhydrazine → benzoic acid N'-[2-(2-bromo-4-fluoro-phenoxy)-acetyl]-N'-isopropyl-hydrazide

HRID 2250886Notes

Reaction equation

HRID 2250886 reaction equation
[Br:1][C:2]1[CH:12]=[C:11]([F:13])[CH:10]=[CH:9][C:3]=1[O:4][CH2:5][C:6]([OH:8])=O.[CH:14]([NH:17][NH:18][C:19](=[O:26])[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)([CH3:16])[CH3:15].C(N(C(C)C)CC)(C)C.F[P-](F)(F)(F)(F)F.Br[P+](N1CCCC1)(N1CCCC1)N1CCCC1>CN(C=O)C>[Br:1][C:2]1[CH:12]=[C:11]([F:13])[CH:10]=[CH:9][C:3]=1[O:4][CH2:5][C:6]([N:17]([CH:14]([CH3:16])[CH3:15])[NH:18][C:19](=[O:26])[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)=[O:8]

Participants

6

Reactant 4

HCID 188691-Benzoyl-2-isopropylhydrazineHCID 81531DiisopropylethylamineHCID 3028732-(2-Bromo-4-fluorophenoxy)acetic acidHCID 2733179PyBroP

Product 1

HCID 58689907benzoic acid N'-[2-(2-bromo-4-fluoro-phenoxy)-acetyl]-N'-isopropyl-hydrazideYield 70%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

A solution of (2-bromo-4-fluoro-phenoxy)-acetic acid (2.00 g, 8.03 mmol) and benzoic acid N′-isopropyl-hydrazide (1.72 g, 9.63 mmol) in DMF (20 mL) was treated with diisopropylethyl amine (3.5 mL, 20.07 mmol) and bromotripyrrolidinophosphonium hexafluorophosphate (PyBroP, 5.62 g, 12.04 mmol) at room temperature overnight. The reaction mixture was partitioned between 1N HCl and ethyl acetate. The organic layer was successively washed with saturated sodium bicarbonate and brine, then dried over sodium sulfate, filtered and concentrated. The crude was absorbed on silica and purified on a silica gel column with a 20-30% ethyl acetate/hexanes gradient to afford the product as a white crystalline solid (2.29 g, 70%).

Workup

  1. customThe reaction mixture was partitioned between 1N HCl and ethyl acetate
  2. washThe organic layer was successively washed with saturated sodium bicarbonate and brine
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe crude was absorbed on silica
  7. custompurified on a silica gel column with a 20-30% ethyl acetate/hexanes gradient

Sources & evidence

ORD record
ord-547bc9c2faba4a358b17e029cab71dbc
Source dataset
uspto-grants-2008_01
Patent number
US07317125B2

Reaction notes

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