Toluene → 3-(2-Benzothiazolyl)-5-(phenylmethyl)-2-thioxo-4-thiazolidinone
Reaction equation
COC(=O)C(CC1C=CC=CC=1)N[C:6]([NH:8][C:9]1[S:10][C:11]2[CH:17]=[CH:16][CH:15]=[CH:14][C:12]=2[N:13]=1)=[S:7].[OH2:26].C1(C)C=C[C:30]([S:33](O)(=O)=O)=[CH:29]C=1.[C:38]1([CH3:44])[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=1>>[S:10]1[C:11]2[CH:17]=[CH:16][CH:15]=[CH:14][C:12]=2[N:13]=[C:9]1[N:8]1[C:29](=[O:26])[CH:30]([CH2:44][C:38]2[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=2)[S:33][C:6]1=[S:7]Participants
Procedure
A solution of N-[(2-benzothiazolylamino)thioxomethyl]-DL-phenylalanine methyl ester (1.0 g, 2.69 mmol) and p-toluene sulfonic acid hydrate (0.20 g 1.05 mmol) in toluene (80 mL) was refluxed with a Dean-Stark trap for 36 h. The reaction was cooled to room temperature, solvent removed under reduced pressure, residue taken up in ethyl acetate, washed with saturated sodium bicarbonate and saturated sodium chloride, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting product was recrystallized from ethyl acetate-hexanes to provide 74.9 mg (8% of the titled product: mp 187°-189° C.; IR (KBr, cm-1) 3250, 1766, 1522, 1489; 1H NMR (300 MHz, DMSO-d6) δ 11.00 (s, 1H), 8.18 (d, 1H), 8.02 (d, 1H), 7.08-8.00 (m, 2H), 7.37 (m, 3H), 7.23 (d, 2H), 4.97 (t, 1H), 3.18 (d, 2H); MS (FD) m/e 339(M+); UV (EtOH) 300 nm (ε=7355), 265 nm (ε=19454), 217 nm (ε=26558), 203 nm (ε=31150). Anal. Calcd for C17H13N3OS2 : C, 60.16; H,3.86; N,12.38. Found: C, 60.33; H, 4.14; N, 12.25.
Workup
- customsolvent removed under reduced pressure, residue
- washwashed with saturated sodium bicarbonate and saturated sodium chloride
- dry with materialdried over magnesium sulfate
- concentrationconcentrated under reduced pressure
- customThe resulting product was recrystallized from ethyl acetate-hexanes
Sources & evidence
- ORD record
- ord-fdc4dbb01cfa4fe09b57ac1316105569
- Source dataset
- uspto-grants-1997_08
- Patent number
- US05658907
Reaction notes
Loading…