Efficient Synthesis of Chromones with Alkenyl Functionalities by the Heck Reaction
作者:Tamás Patonay、Attila Vasas、Attila Kiss-Szikszai、Artur M. S. Silva、José A. S. Cavaleiro
DOI:10.1071/ch10295
日期:——
the Heck reaction in the field of chromones has been demonstrated. Bromochromones with the halogen atom in their rings A and B were reacted with various terminal alkenes to give hitherto unknown alkenyl‐substituted chromones. Reactivity of the substrates was found to markedly depend on the position of the bromine atom. Under phosphine‐free conditions using a phase‐transfer catalyst additive (tetrabutylammonium
已经证明了Heck反应在色酮领域中的有用性。使在环A和B中具有卤素原子的溴色酮与各种末端烯烃反应,生成迄今未知的烯基取代的色酮。发现底物的反应性显着取决于溴原子的位置。在无膦条件下,使用相转移催化剂添加剂(四丁基溴化铵),可以缩短反应时间,通常获得更高的收率。