已经开发出一种高效的级联序列,用于合成2,3-二取代的咪唑并[1,2- a ]吡啶,具有中度到优异的排他选择性。该级联反应是通过使用铜(II)-Pybox作为催化剂在炔丙基醇衍生物上于吡啶氮原子处将2-氨基吡啶进行炔丙基化反应开始的,然后进行分子内环化和异构化。除了2-氨基吡啶,反应性较低的2-氨基嘧啶,2-氨基吡嗪和3-氨基哒嗪也适用于该级联反应。
A facile method for direct Pd(OAc)2-catalyzed oxidative cross-coupling of unactivated imidazo[1,2-a]pyridine with simplearenes has been developed. The reaction shows good reaction efficiency, high regioselectivity, and good functional-group compatibility. This approach provides a useful protocol for the preparation of imidazo[1,2-a]pyridine–arene structure of interest in biological and pharmaceutical
已开发了一种简便的方法,用于未活化的咪唑并[1,2- a ]吡啶与简单的芳烃的直接Pd(OAc)2催化的氧化交叉偶联。该反应显示出良好的反应效率,高的区域选择性和良好的官能团相容性。该方法为生物和药物材料中感兴趣的咪唑并[1,2 - a ]吡啶-芳烃结构的制备提供了有用的方案。
An unprecedented Pd-catalyzed decarboxylative coupling reaction of aromatic carboxylic acids in aqueous medium under air: synthesis of 3-aryl-imidazo[1,2-a]pyridines from aryl chlorides
An efficient and practical protocol for palladium-catalyzeddecarboxylative arylation of imidazo[1,2-a]pyridine-3-carboxylic acids with aryl chlorides has been developed. Note that the reaction could proceed smoothly without an additive in aqueous medium under an ambient atmosphere, and the addition of H2O could effectively promote the decarboxylative arylation. Particularly noteworthy is that these
已开发出一种有效,实用的方案,用于钯催化的咪唑并[1,2 - a ]吡啶-3-羧酸与芳基氯化物的脱羧芳基化反应。注意,在环境气氛下在水性介质中没有添加剂的情况下反应可以顺利进行,并且H 2 O的添加可以有效地促进脱羧芳基化。特别值得注意的是,这些结果代表了Pd催化的(杂)芳香族羧酸在水性介质中在空气中的P催化脱羧偶联反应的第一个实例,以及3-芳基-咪唑并[1,2- a]合成的第一个成功实例。吡啶使用廉价的各种芳基氯化物和杂芳基氯化物作为起始原料。