An application of the PIFA-mediated [PIFA: phenyliodine(III) bis(trifluoroacetate)] biarylcoupling reaction is presented and extended to the formation of heterobiaryl connections. A preliminary study of the scope and limitations of this procedure was carried out in the synthesis of phenanthroids 11 from a series of phenethyl-substituted heterocycles 10. It was observed that in some cases a competitive
A concise synthesis of the title compounds 6 is accomplished in high overall yield in a two step process starting from bromoketone 4. A thiazole ring formation and a non-phenolic oxidative coupling reaction using PIFA are features of me described synthesis. An exploration of the electronic requirements and the regioselectivity of the cyclization is also presented. (C) 1999 Elsevier Science Ltd. All rights reserved.
787. Polymethin dyes from 4 : 5-disubstituted thiazoles
作者:Edward B. Knott
DOI:10.1039/jr9520004099
日期:——
941. Oxazole cyanine and merocyanine dyes, and intermediates