Copper(I)-Catalyzed Cascade Synthesis of 2-Substituted 1,3-Benzothiazoles: Direct Access to Benzothiazolones
作者:Siva Murru、Pravat Mondal、Ramesh Yella、Bhisma K. Patel
DOI:10.1002/ejoc.200900711
日期:2009.11
An efficient cascade process for the preparation of 2-substituted 1,3-benzothiazoles directly from 2-haloaryl isothiocyanates and O or S nucleophiles by a Cu-catalyzed, intramolecular, C–S bond formation has been developed. This cascade method is viable for the efficient syntheses of both O- and S-substituted 1,3-benzothiazoles. Furthermore, 1,3-benzothiazol-2(3H)-ones having an alkyl group allow easy
Synthesis and Reactivity Studies of a New Reagent, Ethyltriphenylphosphonium Tribromide
作者:Latonglila Jamir、B. Alimenla、Anil Kumar、Dipak Sinha、Upasana B. Sinha
DOI:10.1080/00397910903531912
日期:2010.12.21
A new reagent, ethyltriphenyl phosphonium tribromide (ETPPTB), has been synthesized and studied. Results show that the reagent is quite efficient for various reactions such as organic bominations, acylations, and isothiocyanate preparation.
Intra- and Intermolecular C−S Bond Formation Using a Single Catalytic System: First Direct Access to Arylthiobenzothiazoles
作者:Siva Murru、Harisadhan Ghosh、Santosh K. Sahoo、Bhisma K. Patel
DOI:10.1021/ol9017535
日期:2009.10.1
We have for the first time developed two ligand-assisted Cu(I)-catalyzed sequential intra- and intermolecular Sarylations leading to the direct synthesis of arylthiobenzothiazoles in one pot without an inert atmosphere. Low catalyst loading, inexpensive metal catalyst and ligand, lower reaction temperature, and shorter reaction times make this method superior to all reported methods for the synthesis of arylthiobenzothiazole.