Potassium Carbonate → 3-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid {1-[2-(7-difluoromethoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amide

HRID 1019950Notes

Reaction equation

HRID 1019950 reaction equation
C(OC(=O)[C:5](Cl)([F:7])[F:6])C.[OH:10][C:11]1[CH:20]=[C:19]2[C:14]([N:15]=[CH:16][C:17]([O:21][CH2:22][CH2:23][N:24]3[CH2:29][CH2:28][CH:27]([NH:30][C:31]([C:33]4[CH:34]=[CH:35][C:36]5[S:41][CH2:40][C:39](=[O:42])[NH:38][C:37]=5[CH:43]=4)=[O:32])[CH2:26][CH2:25]3)=[N:18]2)=[CH:13][CH:12]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[F:6][CH:5]([F:7])[O:10][C:11]1[CH:20]=[C:19]2[C:14]([N:15]=[CH:16][C:17]([O:21][CH2:22][CH2:23][N:24]3[CH2:29][CH2:28][CH:27]([NH:30][C:31]([C:33]4[CH:34]=[CH:35][C:36]5[S:41][CH2:40][C:39](=[O:42])[NH:38][C:37]=5[CH:43]=4)=[O:32])[CH2:26][CH2:25]3)=[N:18]2)=[CH:13][CH:12]=1

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 67843Acetic acid, 2-chloro-2,2-difluoro-, ethyl esterHCID 1363794043-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid {1-[2-(7-hydroxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amide

Product 1

HCID 468533283-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid {1-[2-(7-difluoromethoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amide

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

Chloro-difluoro-acetic acid ethyl ester (13.8 μL, 0.10 mmol, 1.0 eq) is added at room temperature to a stirred solution of 3-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid {1-[2-(7-hydroxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amide (50 mg, 0.10 mmol, 1.0 eq) in N,N-dimethylformamide (5 mL), followed by potassium carbonate (14.4 mg, 0.10 mmol, 1.0 eq). After 15 hours stirring at 70° C., solvent is evaporated and the residue is acidified with 1N hydrochloric acid aqueous solution and the resulting aqueous layer is extracted with ethyl acetate (3×10 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give a residue that is purified by preparative HPLC to afford 3-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid {1-[2-(7-difluoromethoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amide as a white lyophilizated powder (5 mg, 10% yield).

Workup

  1. customsolvent is evaporated
  2. extractionthe resulting aqueous layer is extracted with ethyl acetate (3×10 mL)
  3. dry with materialThe combined organic layers are dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customto give a residue that
  7. customis purified by preparative HPLC

Sources & evidence

ORD record
ord-9937e2ee0b584b48ac428ad1f8c7966b
Source dataset
uspto-grants-2014_05
Patent number
US08716280B2

Reaction notes

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