Microwave assisted fluorination: an improved method for side chain fluorination of substituted 1-arylethanones
作者:Thor Håkon Krane Thvedt、Erik Fuglseth、Eirik Sundby、Bård Helge Hoff
DOI:10.1016/j.tet.2009.09.070
日期:2009.11
microwave (MW) assisted fluorination of 1-arylethanones to their corresponding 1-aryl-2-fluoroethanones has been developed. The first step utilises Selectfluor™ as a fluorinating agent in methanol forming 1-aryl-2-fluoroethanones and their corresponding dimethyl acetals. In the second step, water is added and Selectfluor™ acts as a Lewis acid in the hydrolytic cleavage of the dimethyl acetals. Compared to
已经开发了一种两步一锅微波(MW)辅助将1-蒽酮氟化为相应的1-芳基-2-氟乙酮的方法。第一步利用Selectfluor™作为甲醇中的氟化剂,形成1-芳基-2-氟乙酮及其相应的二甲基乙缩醛。在第二步中,添加水,并且Selectfluor™在二甲基乙缩醛的水解裂解中充当路易斯酸。与热合成相比,MW辅助方法可减少氟化反应和二甲基乙缩醛反应的反应时间。而且,一锅法减少了试剂和溶剂的消耗。该方法最适合于制备含有可钝化亲电芳族取代基的取代基的1-芳基-2-氟乙酮,但高度缺电子的酮如1-(3,5-二硝基苯基)乙酮反应更慢。使用富含电子的芳族酮进行的反应具有较低的区域选择性,并且还产生了氟代芳族产物。