Efficient Two-Step Synthesis of 9-Aryl-6-hydroxy-3<i>H</i>-xanthen-3-one Fluorophores
作者:James P. Bacci、Aaron M. Kearney、David L. Van Vranken
DOI:10.1021/jo051243i
日期:2005.10.1
synthesis of 9-aryl-6-hydroxy-3H-xanthen-3-one fluorophores involving condensation of aryl aldehydes and fluororesorcinol is shown to proceed through a triarylmethane intermediate. The condensation is complicated by retro-Friedel−Crafts reactions which can be minimized by controlling the amount of acid. The xanthenone ring system is prepared by a final oxidative cyclization with DDQ.