Conversion of thiobenzamides to benzothiazoles via intramolecular cyclization of the aryl radical cation
作者:Nadale K. Downer-Riley、Yvette A. Jackson
DOI:10.1016/j.tet.2008.06.023
日期:2008.8
A new and general method has been developed for the intramolecular cyclization of thiobenzamides to benzothiazoles via aryl radicalcations as reactive intermediates. The method utilizes phenyliodine(III) bis(trifluoroacetate) (PIFA) in trifluoroethanol or cerium ammonium nitrate (CAN) in aqueous acetonitrile at room temperature to effect cyclization within 30 min in moderate yields.
Iodine-mediated cyclisation of thiobenzamides to produce benzothiazoles and benzoxazoles
作者:Nadale K. Downer-Riley、Yvette A. Jackson
DOI:10.1016/j.tet.2007.07.076
日期:2007.10
Synthesis of benzothiazoles by reaction of iodine with thiobenzamides, which do not possess an ortho alkoxy or ester group, is described. The unlikely synthesis of benzoxazoles from reaction of 2-alkoxythiobenzamides with iodine is also reported. (C) 2007 Elsevier Ltd. All rights reserved.
Synthesis of benzothiazoles viaipso substitution of ortho-methoxythiobenzamides
作者:Nadale K. Downer、Yvette A. Jackson
DOI:10.1039/b410373d
日期:——
An efficient route to the synthesis of benzothiazoles from ortho-methoxythiobenzamides via the ipso substitution of an aromatic methoxy group is presented, and the mechanism of the Jacobson synthesis of benzothiazoles is further investigated.