Direct Catalytic Access to N-Silylated Enamines from Enolizable Imines and Hydrosilanes by Base-Free Dehydrogenative SiN Coupling
作者:Julia Hermeke、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1002/chem.201402866
日期:2014.7.21
α‐proton rather than α‐deprotonation of the enolizable imine followed by reaction with an electrophilic silicon reagent. The silicon electrophile, stabilized by a sulfur atom, is generated by cooperative activation of an SiH bond at the RuS bond of a tethered ruthenium(II) thiolate complex. After transfer of the silicon cation onto the imine nitrogen atom, the remaining ruthenium(II) hydride fulfills
报道了合成否则难以制备的N-甲硅烷基化烯胺的方法,该方法是衍生自伯胺的被掩蔽的烯胺。该方法基于甲硅烷基亚胺离子的形成和随后酸化的α-质子的提取,而不是可烯化的亚胺的α-去质子化,然后与亲电子的硅试剂反应。硅电体,通过一个硫原子稳定化,是通过在Si的协同活化产生在茹H键栓系钌(II)硫醇盐配合物的S键。将硅阳离子转移到亚胺氮原子上后,剩余的氢化钌(II)发挥碱的作用。脱质子化和释放出氢气结束了催化循环。净反应是脱氢硅 Ñ烯醇化亚胺和氢硅烷的耦合。