An efficient synthetic route to biologically relevant 2-phenylbenzothiazoles substituted on the benzothiazole ring
作者:Ashley A. Weekes、Mark C. Bagley、Andrew D. Westwell
DOI:10.1016/j.tet.2011.08.004
日期:2011.10
focus on their unsubstituted ring counterparts. Here we describe a new concise and efficient synthetic route to biologically relevant 2-phenylbenzothiazoles in high yield from the reaction of substituted 2-aminothiophenol disulfides and benzaldehydes, promoted by the inexpensive and non-toxic inorganic oxidant sodiummetabisulfite in DMSO at 120 °C. Our new method is tolerant of a range of substituents
Convenient Synthesis of Substituted 2-Phenylbenzothiazoles Using Solid-Supported Triphenylphosphine
作者:Ashley A. Weekes、Jan Frydrych、Andrew D. Westwell
DOI:10.1080/00397911.2012.730648
日期:2013.10.2
We report an improved procedure using solid-supported triphenylphosphine for the concise synthesis of biologically relevant 2-phenylbenzothiazoles featuring a variety of substituents on both the benzothiazole and phenyl rings. Substituted 2-phenylbenzothiazoles were synthesized by heating equimolar quantities of 2-aminothiophenol disulfides with benzaldehydes and p-toluenesulfonic acid in the presence of polymer-supported triphenylphosphine in dimethylformamide/toluene. Appealing features of this new method include simple isolation of product (removal of phosphine oxide by-product by filtration), avoidance of column chromatography, and good yields of substituted 2-phenylbenzothiazole products. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.