Direct C3-Selective Arylation of N-Unsubstituted Indoles with Aryl Chlorides, Triflates, and Nonaflates Using a Palladium–Dihydroxyterphenylphosphine Catalyst
作者:Miyuki Yamaguchi、Ryoya Hagiwara、Kanami Gayama、Kohei Suzuki、Yusuke Sato、Hideyuki Konishi、Kei Manabe
DOI:10.1021/acs.joc.0c01494
日期:2020.8.21
successfully applied to the direct C3-arylation of N-unsubstituted indoles with aryl chlorides, triflates, and nonaflates. This catalyst showed C3-selectivity, whereas catalysts with other structurally related ligands exhibited N1-selectivity. Complex formation between the lithium salts of the ligand and the indole is assumed to accelerate the arylation at the C3 position. Reactions using 3-alkylindoles afforded
钯-二羟基叔苯基膦(DHTP)催化剂已成功地用于N-未取代的吲哚与芳基氯化物,三氟甲磺酸酯和壬二酸酯的直接C3-芳基化。该催化剂显示出C3-选择性,而具有其他结构相关配体的催化剂则显示出N1-选择性。假定在配体的锂盐和吲哚之间形成络合物,以促进C3位的芳基化。使用3-烷基吲哚的反应得到3,3-二取代的吲哚啉,其可以进一步转化为相应的二氢吲哚衍生物。