在钯催化剂的存在下,在 50 °C 的甲苯中将甲硅烷基硼酸酯加成到吡啶中,以高产率得到 N-boryl-4-silyl-1,4-二氢吡啶。2-甲基吡啶和3-取代吡啶的反应也进行区域选择性1,4-硅化反应,而4-取代吡啶进行1,2-硅化反应,区域选择性地得到N-boryl-2-silyl-1,2-二氢吡啶。
C2-Selective silylation of pyridines by a rhodium–aluminum complex
作者:Naofumi Hara、Nao Uemura、Yoshiaki Nakao
DOI:10.1039/d1cc00278c
日期:——
We have developed a C2-selective mono-silylation of a variety of pyridines using a Rh–Al complex. Both the site- and mono-selectivity are controlled via the pyridine coordination to the Lewis-acidic Al center prior to the activation of the pyridine C(2)–H bond at the proximal Rh center. A reaction mechanism is proposed based on several mechanistic studies, including the isolation of a (2-pyridyl)silylrhodium