Potassium Carbonate → 7-Nitro-2H-benzo[b][1,4]thiazin-3(4H)-one

HRID 1991287Notes

Reaction equation

HRID 1991287 reaction equation
[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][C:3]=1[SH:11].C(=O)([O-])[O-].[K+].[K+].Br[CH2:19][C:20](OC)=[O:21]>CN(C=O)C>[N+:8]([C:5]1[CH:6]=[CH:7][C:2]2[NH:1][C:20](=[O:21])[CH2:19][S:11][C:3]=2[CH:4]=1)([O-:10])=[O:9]

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 60984Methyl bromoacetateHCID 109866912-Amino-5-nitrobenzenethiol

Product 1

HCID 3701217-Nitro-2H-benzo[b][1,4]thiazin-3(4H)-oneYield 74%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
50 °C

Procedure

To a stirred suspension of 2-amino-5-nitrobenzenethiol (Step 1, 29 g, 139.8 mmol) and potassium carbonate (115.93 g, 838.8 mmol) in dry DMF (150 mL) is added methyl bromoacetate (15.88 mL, 167.8 mmol). The reaction mixture is heated at 50° C. for 16 h at which time the reaction is quenched with ice and water (50 mL). The precipitate is filtered and dried under high vacuum to give the title compound as a yellow solid (21.69 g, 74%), MS m/z 211.5 (M+H)+.

Workup

  1. customis quenched with ice and water (50 mL)
  2. filtrationThe precipitate is filtered
  3. customdried under high vacuum

Sources & evidence

ORD record
ord-a03a96a252ba48f0a81d170526c9c614
Source dataset
uspto-grants-2010_01
Patent number
US07645781B2

Reaction notes

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