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

HRID 1019851Notes

Reaction equation

HRID 1019851 reaction equation
[O:1]=[C:2]1[NH:7][C:6]2[CH:8]=[C:9]([C:12]([OH:14])=O)[CH:10]=[CH:11][C:5]=2[S:4][CH2:3]1.[CH3:15][O:16][C:17]1[CH:26]=[C:25]2[C:20]([N:21]=[CH:22][C:23]([O:27][CH2:28][CH2:29][N:30]3[CH2:35][CH2:34][CH:33]([NH2:36])[CH2:32][CH2:31]3)=[N:24]2)=[CH:19][CH:18]=1.ON1C2C=CC=CC=2N=N1.Cl.CN(C)CCCN=C=NCC.C(N(CC)C(C)C)(C)C>CN(C)C=O>[CH3:15][O:16][C:17]1[CH:26]=[C:25]2[C:20]([N:21]=[CH:22][C:23]([O:27][CH2:28][CH2:29][N:30]3[CH2:31][CH2:32][CH:33]([NH:36][C:12]([C:9]4[CH:10]=[CH:11][C:5]5[S:4][CH2:3][C:2](=[O:1])[NH:7][C:6]=5[CH:8]=4)=[O:14])[CH2:34][CH2:35]3)=[N:24]2)=[CH:19][CH:18]=1

Participants

7

Reactant 5

HCID 757711-HydroxybenzotriazoleHCID 81531DiisopropylethylamineHCID 7609933-oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylic acidHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 667474691-[2-(7-Methoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-ylamine

Product 1

HCID 468520703-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid {1-[2-(7-methoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amideYield 14%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

3-Oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid (60 mg, 0.26 mmol, 1.0 eq) is added at room temperature to a stirred solution of 1-[2-(7-methoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-ylamine (80 mg, 0.26 mmol, 1.0 eq) in N,N-dimethylformamide (5 mL), followed by 1-hydroxybenzotriazole (38 mg, 0.29 mmol, 1.1 eq), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (57 mg, 0.30 mmol, 1.15 eq) and N,N-diisopropylethylamine (100 μL, 0.58 mmol, 2.25 eq). After 15 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×10 mL) and water (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-methoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-amide as an off-white solid (18 mg, 13% yield).

Workup

  1. customsolvent is evaporated
  2. extractionthe residue is extracted with dichloromethane (3×10 mL) and water (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-c7538cffac8f41bb9d23db202a1dcbbd
Source dataset
uspto-grants-2014_05
Patent number
US08716280B2

Reaction notes

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