see text] This paper describes Sonogashira cross-coupling of functionalized 2-, 4-, and 5-trifloyl oxazoles and thiazoles with terminal alkynes. This methodology has been extended to 2,4-ditrifloylthiazoles, which results in regioselective cross-coupling at the C2-position of the thiazole. The resulting 2-alkynyl-4-trifloylthiazoles are effective electrophiles in a second palladium(0)-mediated cross-coupling
[反应:参见正文]本文描述了功能化的2-,4-和5-三
氟甲
恶唑和
噻唑与末端
炔烃的Sonogashira交叉偶联。该方法已经扩展到2,4-二
甲苯基
噻唑,这导致在
噻唑的C2位区域选择性交叉偶联。在第二个
钯(0)介导的交叉偶联反应中,所得的2-炔基-4-三
氟噻唑是有效的亲电子试剂。