Catalytic 1,4-Selective Hydrosilylation of Pyridines and Benzannulated Congeners
作者:C. David F. Königs、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1002/anie.201305028
日期:2013.9.16
The hydrosilylation of pyridines and quinolines is strictly 1,4‐selective and likely involves an ionic one‐step rather than the established radical two‐step hydride transfer from a ruthenium(II) hydride complex onto the respective pyridinium and quinolinium ion intermediates (see scheme; ArF=3,5‐(CF3)2C6H3). Even 4‐substituted substrates react highly regioselectively. Isoquinolines yield the 1,2‐reduced
根本不同!吡啶和喹啉的氢化硅烷化严格是1,4-选择性的,可能涉及离子一步法,而不是既定的自由基二步法将氢化物从氢化钌(II)转移到相应的吡啶鎓和喹啉鎓离子中间体上(参见方案) ; Ar F= 3,5-(CF 3)2 C 6 H 3)。甚至4个被取代的底物也具有高度区域选择性的反应。异喹啉可生成1,2还原的杂环。
Mono(hydrosilylation) of N-Heterocycles Catalyzed by B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> and Silylium Ion
作者:William D. Petrushko、Georgii I. Nikonov
DOI:10.1021/acs.organomet.0c00697
日期:2020.12.28
Catalytic hydrosilylations of various N-heterocycles mediated by silyliumion and electrophilic borane catalysts are reported. The reactions proceed via intermediate silylquinolinium ions that give rise to a variety of reduced and coupling products. Generally, highly selective 1,4-regioselectivity is observed.