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Microwave Induced Facile One-Pot Access to Diverse 2-cyanobenzothiazole-A Key Intermediate for the Synthesis of Firefly Luciferin

Prajapati N. P., Vekariya R. H., Patel H. D.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 44

81--89

An eco-friendly one-step preparation of various substituted 2-cyanobenzothiazole by condensation of corresponding substituted ortho-aminothiophenol with ethyl cyanoformate, employing an effective amount of Lawesson’s reagent, under microwave irradiation (MWI) and solvent free conditions is presented. The structures of the compounds were elucidated with the aid of elemental analysis, IR, 1H-NMR and mass spectral data. The targeted various substituted 2-cyanobenzothiazole are obtained in good yields and high purity.

Synthesis of Thio Derivatives of Phenobarbital and Its N-Methyl Derivatives

Stasiewicz-Urban A., Kubaszek M., Żylewski M., Cegła M., Bojarski J.

Polish Journal of Chemistry

2004

Vol.78 /nr 11-12

2105-2115

Differently substituted thio derivatives of phenobarbital and its N-mono- and N,N'-dimethyl derivatives were obtained by thionation of respective substrates with Lawesson's reagent. The structure of the products not described in the literature was confirmed by spectral and elemental analyses. The spectral properties allow to differentiate between positional isomers of the products.