Trifluoroacetic acid → 2-[6-(2-Aminoethyl)-2-pyridyl]-4h-1,3-benzothiazine-4-one trifluoroacetic acid salt
Reaction equation
[O:1]=[C:2]1[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][C:6]=2[S:5][C:4]([C:12]2[N:17]=[C:16]([CH2:18][CH2:19][NH:20]C(=O)OC(C)(C)C)[CH:15]=[CH:14][CH:13]=2)=[N:3]1.[F:28][C:29]([F:34])([F:33])[C:30]([OH:32])=[O:31]>>[F:28][C:29]([F:34])([F:33])[C:30]([OH:32])=[O:31].[NH2:20][CH2:19][CH2:18][C:16]1[N:17]=[C:12]([C:4]2[S:5][C:6]3[CH:11]=[CH:10][CH:9]=[CH:8][C:7]=3[C:2](=[O:1])[N:3]=2)[CH:13]=[CH:14][CH:15]=1Participants
3
Procedure
tert-Butyl 2-[6-(4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]ethylcarbamate (0.35 g, 0.91 mmol) was dissolved in trifluoroacetic acid (4 ml), and the mixture was stirred at room temperature for 2 hrs. The solvent was evaporated, and the residue was recrystallized from methanol-diisopropyl ether to give the titled compound (0.33 g, 91%) as white crystals.
Workup
- customThe solvent was evaporated