Development of a convenient synthetic route to aminochromenes via Buchwald C–N coupling
作者:Ekaterina A. Shilova、Valery P. Perevalov、André Samat、Corinne Moustrou
DOI:10.1016/j.tetlet.2007.04.003
日期:2007.6
A convenient new synthetic route to p-aminophenylaminobenzo- and naphthopyrans was developed via palladium-catalyzed C-N coupling. It was demonstrated that novel targeted aminoderivatives reveal photochromic properties. The structure of intermediate p-nitrophenylaminochromenes was confirmed by X-ray crystallographic analysis. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis of heterocyclic chromenes via Buchwald C–N coupling and the substituent effect on their photochromic properties
作者:Ekaterina A. Shilova、Gérard Pèpe、André Samat、Corinne Moustrou
DOI:10.1016/j.tet.2008.07.116
日期:2008.10
Synthesis of series of new heterocyclic [2]H- and [3]H-chromenes via Buchwald C-N coupling is described. Introduction of heterocyclic substituent to 6-position of benzopyrans and in 8-position of naphthopyrans led to significant bathochromic shift (up to 154 nm) in the spectra of their open forms. Substituted benzopyrans display high colorability values along with acceptable resistance to fatigue. By using judicious substituents, the absorption range of this type of pyrans can be tuned according to the nature of the heterocyclic unit, and the photochromic properties of pyrans could be adjusted to desired values. (C) 2008 Elsevier Ltd. All rights reserved.