Water → 4-[2-(3-Amino-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester

HRID 1393730Notes

Reaction equation

HRID 1393730 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([CH2:14][C:15]2[N:20]=[C:19]3[N:21]=[C:22]([C:24]4[CH:29]=[CH:28][CH:27]=[C:26]([N+:30]([O-])=O)[CH:25]=4)[O:23][C:18]3=[CH:17][CH:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].O.O.[SH-].[Na+]>CO>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([CH2:14][C:15]2[N:20]=[C:19]3[N:21]=[C:22]([C:24]4[CH:29]=[CH:28][CH:27]=[C:26]([NH2:30])[CH:25]=4)[O:23][C:18]3=[CH:17][CH:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

5

Reactant 3

HCID 962WaterHCID 16211346Sodium hydrosulfide hydrateHCID 596799094-[2-(3-Nitro-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 596802784-[2-(3-Amino-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

4-[2-(3-Nitro-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester (330 mg, 0.75 mmol) was dissolved in 6 mL of MeOH and 2 mL of water along with 210 mg of sodium hydrosulfide hydrate (3.75 mmol). The reaction mixture was stirred under reflux for 4 hours. The reaction appeared to be complete based on LC/MS. The reaction mixture was cooled to room temperature and concentrated. The aqueous layer was extracted with CH2Cl2. The combined organic layers were dried (Na2SO4) and concentrated to afford essentially quantitative yield of 4-[2-(3-amino-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester.

Workup

  1. temperatureunder reflux for 4 hours
  2. concentrationconcentrated
  3. extractionThe aqueous layer was extracted with CH2Cl2
  4. dry with materialThe combined organic layers were dried (Na2SO4)
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-e474c459545243c3aca2dc3b9c915b76
Source dataset
uspto-grants-2008_03
Patent number
US07345178B2

Reaction notes

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