A facile and versatile strategy employing TiCl4-mediated cyclization followed by a Cannizzaro reaction has been developed for the synthesis of various xanthene derivatives. The reaction proceeded smoothly to afford both xanthenes/xanthones or their sulfur derivatives and tolerated a wide range of electronically diverse substrates. Using this methodology, pranoprofen was synthesized in three steps in
已经开发了一种简便且通用的策略,该方法采用TiCl 4介导的环化反应,然后进行Cannizzaro反应,以合成各种x吨衍
生物。反应进行得很顺利,既提供了x吨//吨或它们的
硫衍
生物,并且可以耐受多种电子多样性的底物。使用这种方法,可从市售原料中分三步以59%的总产率合成pranoprofen。