Sonogashira Coupling of Functionalized Trifloyl Oxazoles and Thiazoles with Terminal Alkynes: Synthesis of Disubstituted Heterocycles
作者:Neil F. Langille、Les A. Dakin、James S. Panek
DOI:10.1021/ol026099r
日期:2002.7.1
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。