Water → 1-BOC-5-methyl-7-nitro-indole-2-carboxylic acid methyl ester

HRID 336456Notes

Reaction equation

HRID 336456 reaction equation
[CH3:1][O:2][C:3]([C:5]1[NH:6][C:7]2[C:12]([CH:13]=1)=[CH:11][C:10]([CH3:14])=[CH:9][C:8]=2[N+:15]([O-:17])=[O:16])=[O:4].C(N(CC)CC)C.[O:25](C(OC(C)(C)C)=O)[C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=O.O>ClCCl.CN(C)C1C=CN=CC=1>[CH3:1][O:2][C:3]([C:5]1[N:6]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:25])[C:7]2[C:12]([CH:13]=1)=[CH:11][C:10]([CH3:14])=[CH:9][C:8]=2[N+:15]([O-:17])=[O:16])=[O:4]

Participants

7

Reactant 4

HCID 962WaterHCID 8471TriethylamineHCID 90495Di-tert-butyl dicarbonateHCID 594480925-Methyl-7-nitro-1H-indole-2-carboxylic acid methyl ester

Product 1

HCID 595429701-BOC-5-methyl-7-nitro-indole-2-carboxylic acid methyl esterYield 101.7%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent2×

Procedure

5-Methyl-7-nitro-1H-indole-2-carboxylic acid methyl ester (24.0 g, 100 mmol) prepared in Preparation 15 was dissolved in dichloromethane (500 mL), to which were added triethylamine (84 mL, 601 mmol) and 4-(dimethylamino)pyridine (600 mg, 5 mmol). (BOC)2O (43.7 g, 200 mmol) dissolved in dichloromethane (100 mL) was added in drops thereto, and the mixture was stirred for 8 h at room temperature. After completion of the reaction, water was added. The reaction mixture was extracted with ethyl acetate, washed with saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to give the title compound (34.0 g, Yield 100%).

Workup

  1. additionwas added in drops
  2. additionwas added
  3. extractionThe reaction mixture was extracted with ethyl acetate
  4. washwashed with saturated aqueous sodium chloride solution
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-e419d92fae154276905f0a20061c4485
Source dataset
uspto-grants-2014_11
Patent number
US08889691B2

Reaction notes

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