Rh-Catalyzed Borylation of N-Adjacent C(sp<sup>3</sup>)–H Bonds with a Silica-Supported Triarylphosphine Ligand
作者:Soichiro Kawamorita、Tatsuya Miyazaki、Tomohiro Iwai、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1021/ja305694r
日期:2012.8.8
Direct C(sp(3))-H borylation of amides, ureas, and 2-aminopyridine derivatives at the position α to the N atom, which gives the corresponding α-aminoalkylboronates, has been achieved with a heterogeneous catalyst system consisting of [Rh(OMe)(cod)]2 and a silica-supported triarylphosphine ligand (Silica-TRIP) that features an immobilized triptycene-type cage structure with a bridgehead P atom. The
酰胺、脲和 2-氨基吡啶衍生物在 N 原子的 α 位置直接 C(sp(3))-H 硼酸化,得到相应的 α-氨基烷基硼酸酯,已使用由 [Rh (OMe)(cod)]2 和二氧化硅负载的三芳基膦配体 (Silica-TRIP),具有固定的三苯乙烯型笼结构和桥头 P 原子。在温和的反应条件(25-100 °C,0.1-0.5 mol % Rh)下,反应不仅发生在末端 CH 键上,而且发生在内部二级 CH 键上。