Trifluoroacetic acid → 4-nitrophenyl 7-(N-(thiazol-2-yl)sulfamoyl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate

HRID 528585

Reaction equation

HRID 528585 reaction equation
COC1C=CC(C[N:8]([C:34]2[S:35][CH:36]=[CH:37][N:38]=2)[S:9]([C:12]2[CH:13]=[CH:14][C:15]3[N:20]([C:21]([O:23][C:24]4[CH:29]=[CH:28][C:27]([N+:30]([O-:32])=[O:31])=[CH:26][CH:25]=4)=[O:22])[CH2:19][CH2:18][O:17][C:16]=3[CH:33]=2)(=[O:11])=[O:10])=CC=1.FC(F)(F)C(O)=O>C(Cl)Cl>[S:35]1[CH:36]=[CH:37][N:38]=[C:34]1[NH:8][S:9]([C:12]1[CH:13]=[CH:14][C:15]2[N:20]([C:21]([O:23][C:24]3[CH:25]=[CH:26][C:27]([N+:30]([O-:32])=[O:31])=[CH:28][CH:29]=3)=[O:22])[CH2:19][CH2:18][O:17][C:16]=2[CH:33]=1)(=[O:11])=[O:10]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 897616924-nitrophenyl 7-(N-(4-methoxybenzyl)-N-(thiazol-2-yl)sulfamoyl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate

Product 1

HCID 897619374-nitrophenyl 7-(N-(thiazol-2-yl)sulfamoyl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylateYield 91%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 4-nitrophenyl 7-(N-(4-methoxybenzyl)-N-(thiazol-2-yl)sulfamoyl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate (0.050 g, 0.086 mmol) in DCM (0.172 ml) was added trifluoroacetic acid (0.165 ml, 2.146 mmol). The reaction was stirred at RT for 15 minutes until complete deprotection. The reaction was concentrated in vacuo and purified via 500-mg SCX column (product eluted cleanly with methanol wash) to yield, after concentration, 4-nitrophenyl 7-(N-(thiazol-2-yl)sulfamoyl)-2H-benzo[b][1,4]oxazine-4(3 H)-carboxylate (0.036 g, 0.078 mmol, 91% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 12.73 (br. s., 1 H) 8.28-8.38 (m, 2 H) 8.06 (d, J=8.71 Hz, 1 H) 7.55-7.64 (m, 2 H) 7.34 (dd, J=8.75, 2.20 Hz, 1 H) 7.22-7.30 (m, 2 H) 6.83 (d, J=4.60 Hz, 1 H) 4.36-4.48 (m, 2 H) 4.02-4.11 (m, 2 H). m/z (ESI) 462.9 (M+H)+.

Workup

  1. concentrationThe reaction was concentrated in vacuo
  2. custompurified via 500-mg SCX column (product
  3. washeluted cleanly with methanol
  4. washwash)
  5. customto yield

Sources & evidence

ORD record
ord-ff1778cceecc4bdf837a45f811432570
Source dataset
uspto-grants-2016_05
Patent number
US09346798B2

Linked notes

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