HCID 67363471, compound → HCID 67364561, compound

HRID 1893372Notes

Reaction equation

HRID 1893372 reaction equation
[CH2:1]([O:3][C:4](=[O:25])[CH2:5][N:6]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:7][C:8]1[CH:13]=[C:12]([Cl:14])[CH:11]=[CH:10][C:9]=1[N+:15]([O-])=O)[CH3:2].[H][H]>C(OCC)(=O)C.[Pd].[Br-].[Zn+2].[Br-]>[CH2:1]([O:3][C:4](=[O:25])[CH2:5][N:6]([CH2:7][C:8]1[CH:13]=[C:12]([Cl:14])[CH:11]=[CH:10][C:9]=1[NH2:15])[C:18]([O:20][C:21]([CH3:24])([CH3:22])[CH3:23])=[O:19])[CH3:2]

Participants

6

Reactant 2

HCID 67363471HCID 67363471, compoundHCID 178418361HCID 178418361, compound

Product 1

HCID 67364561HCID 67364561, compoundYield 95.5%

Reagents, catalysts & solvents 3

HCID 23938PalladiumCatalystHCID 10421208Zinc bromideCatalystHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of [tert-butoxycarbonyl-(5-chloro-2-nitro-benzyl)-amino]-acetic acid ethyl ester (69.0 g, 0.186 mol) in ethyl acetate (1200 ml) was added zinc bromide (8.5 g, 0.037 mol). The reaction mixture was purged with argon after 15 minutes. After addition of the palladium catalyst (10% on activated charcoal, 7.9 g, 0.0074 mol) the mixture was hydrogenated at ambient pressure during a period of ca. 48 h until ca. 13 l of hydrogen gas had been consumed. The catalyst was removed by filtration and the filtrate was washed with two portions of saturated aqueous sodium bicarbonate solution and brine, each. The organic layer was dried over anhydrous sodium sulfate and concentrated in vacuo to give the title compound (60.6 g, 95.5%) as yellow waxy solid. MS m/e: 343 (M+H+).

Workup

  1. customThe reaction mixture was purged with argon after 15 minutes
  2. customhad been consumed
  3. customThe catalyst was removed by filtration
  4. washthe filtrate was washed with two portions of saturated aqueous sodium bicarbonate solution and brine
  5. dry with materialThe organic layer was dried over anhydrous sodium sulfate
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-553f2522cb1f428eb8efcc48fe930765
Source dataset
uspto-grants-2013_08
Patent number
US08513238B2

Reaction notes

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