报道了以三氯化铋为催化剂,三苯基膦为配体,在四氢呋喃中,65℃下用不活泼的溴代烃、镁与醛简单高效地进行Barbier—Grignard式的芳基化和烷基化.该方法反应条件温和、操作简单、反应时间短、一锅法反应且有高的收率(大部分61%~99%).对空间效应、电子效应和一些新的结果进行了讨论,合理地提出了一个三氯化铋和三苯基膦催化的可能机理.
A highly versatile and efficient method has been developed for the Barbier-Grignard-type arylation and alkylation of aldehydes using unactivated bromides and Mg in tetrahydrofuran at 65 ℃ promoted by BiCl3 and PPh3. This method has offered high yields of 61%-99% mostly, mild reaction conditions, short reaction time, easy workup and a one-pot procedure. The steric, electronic effects and some new results have been discussed. A possible mechanism catalyzed by BiCl3 and Ph3P was reasonably proposed.