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Volumn 20, Issue 12, 2009, Pages 1408-1410

A simple and efficient synthesis of 2-substituted benzothiazoles catalyzed by H2O2/HCl

Author keywords

2 Substituted benzothiazoles; H2O2 HCl; Heterocyclic compounds

Indexed keywords

EID: 70349978282 PISSN: 10018417 EISSN: None Source Type: Journal
DOI: 10.1016/j.cclet.2009.06.037 Document Type: Article

Times cited : (66)

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- Typical experimental procedure for the synthesis of 2-substituted benzothiazoles: In a round-bottomed flask (25 mL) equipped with a magnetic stirrer, a solution of 2-aminothiophenol (1.0 mmol, and aromatic aldehyde (1.0 mmol) in ethanol (10 mL) was prepared. Aq 30% H2O2 (6.0 mmol) and aq 37% HCl (3.0 mmol) were added and the mixture was stirred at room temperature monitored by TLC (eluent: n-hexane/EtOAc, 7:3, When the starting materials had completely disappeared, the mixture was quenched by adding H2O (10 mL, extracted with EtOAc (3× 5 mL, and the combined extracts were dried (MgSO4, The corresponding benzothiazoles were obtained after removal of solvents and purified by silica gel chromatography (eluent: n-hexane/EtOAc, 7:3, Selected characterization data: Compound 3i: white solid, yield 88, IR(KBr, 3407, 3020, 1590, 1512, 1406, 1215, 759 cm-1; 1H NMR 500 MHz, CDCl3, δ ppm, 7.42-7.47
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