Water-promoted Dowex 50W catalyzed highly efficient green protocol for 2-arylbenzothiazole formation
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1002/jhet.9
日期:2009.1
aldehydes were allowed to react in one-pot operation to give 2-aryl-benzothiazoles in excellent yields in the presence of Dowex50W in water. Very high yields coupled with the ease of work-up procedure, formation of no side products, employment of “reusable” catalyst, and “green” synthesis in aqueous medium without maintaining anhydrous reaction conditions are the most important aspects of this methodology
2-Arylation/alkylation of benzothiazoles using superparamagneticgraphene oxide-Fe<sub>3</sub>
O<sub>4</sub>
hybrid material as a heterogeneous catalystwith diisopropyl azodicarboxylate (DIAD) as an oxidant
nanocomposites as a heterogeneous catalyst for arylation/alkylation of benzothiazoles with aldehydes and benzylic alcohols in the presence of diisopropyl azodicarboxylate (DIAD) as an oxidant which exclusively produced 2‐aryl (alkyl)‐1H–benzothizoles in moderate to excellent yields. The absence of precious metals and toxic solvent, easy productisolation, and recyclability of the GO‐Fe3O4 with no loss of
在本报告中,我们介绍了氧化石墨烯-氧化铁(GO-Fe 3 O 4)纳米复合物,作为在偶氮二羧酸二异丙酯(DIAD)作为氧化剂存在下苯并噻唑与醛和苄醇的芳基化/烷基化反应的非均相催化剂2-芳基(烷基)-1 H-苯并噻唑的产率中等至优异。该方法的显着优点是不存在贵金属和有毒溶剂,易于产品分离以及GO‐Fe 3 O 4的可回收性而不损失活性。
Regioselective ortho-hydroxylation of 2-arylbenzothiazole via substrate directed C–H activation
作者:Arghya Banerjee、Anupam Bera、Srimanta Guin、Saroj Kumar Rout、Bhisma K. Patel
DOI:10.1016/j.tet.2012.12.067
日期:2013.3
An efficient protocol has been developed for the direct ortho-hydroxylation of 2-arylbenzothiazole using Pd(OAc)2 as the catalyst and either of DIB/AcOH or Oxone®/TFA combinations under air atmosphere. Under both these conditions, the methodology tolerates a diverse array of substituents giving good to excellent yields of corresponding ortho-hydroxylated products. Regioselective hydroxylation is observed
Benzothiazole Synthesis: Mechanistic Investigation of an In Situ-Generated Photosensitizing Disulfide
作者:Ho Seong Hwang、Sumin Lee、Sung Su Han、Yu Kyung Moon、Youngmin You、Eun Jin Cho
DOI:10.1021/acs.joc.0c01598
日期:2020.9.18
photosensitizing disulfide in benzothiazolesynthesis from 2-aminothiophenol and aldehydes was proposed and confirmed through in-depth mechanistic studies. A series of photophysical and electrochemical investigations revealed that an in situ-generated disulfide photosensitizes molecular oxygen to generate the key oxidants, singlet oxygen and superoxide anion, for the dehydrogenation step.
One-pot synthesis of 2-arylbenzimidazole, 2-arylbenzothiazole and 2-arylbenzoxazole derivatives using vanadium(IV)–salen complex as homogeneous catalyst and vanadium(IV)–salen complex nanoparticles immobilized onto silica as a heterogeneous nanocatalyst
The efficient synthesis of 2-arylbenzimidazole, 2-arylbenzothiazole and 2-arylbenzoxazole derivatives is described by condensation of aryl aldehydes and o-phenylenediamines, 2-aminothiophenol and 2-aminophenol in a single pot using a catalytic amount of vanadium(IV)–salen complex or vanadium–salen nanoparticles supported on silica (5.0 mol%) in excellent isolated yields. The immobilized catalyst was