Palladium-Catalyzed Asymmetric Allylic Alkylations of Polynitrogen-Containing Aromatic Heterocycles
作者:Barry M. Trost、David A. Thaisrivongs、Jan Hartwig
DOI:10.1021/ja205523e
日期:2011.8.17
palladium-catalyzed asymmetric allylic alkylation (AAA) reaction of a variety of nitrogen-containing aromatic heterocycles, including pyrazine, pyrimidine, pyridazine, quinoxaline, and benzoimidazole derivatives. The mesityl ester, whose steric bulk prevents competitive deacylation of the electrophile from "hard" nucleophiles, is introduced as a new leaving group in allylic alkylation chemistry. In contrast to
我们报告了钯催化的各种含氮芳香杂环的不对称烯丙基烷基化 (AAA) 反应,包括吡嗪、嘧啶、哒嗪、喹喔啉和苯并咪唑衍生物。在烯丙基烷基化化学中作为新的离去基团引入了甲基酯,其空间体积可以防止亲电试剂与“硬”亲核试剂的竞争性脱酰。与我们之前对基于吡啶的底物的 AAA 反应的研究相比,在用 LiHMDS 去质子化之前不需要与路易斯酸进行预络合,这强调了这些缺电子亲核试剂的相对酸性。