Pd(0)-Catalyzed Carbene Insertion into Si–Si and Sn–Sn Bonds
摘要:
The first Pd(0)-catalyzed carbene insertion into Si-Si and Sn-Sn bonds has been realized by using N-tosylhydrazones as the carbene precursors. Geminal bis(silane) and geminal bis(stannane) derivatives were obtained in good to excellent yields under mild conditions. Migratory insertion of Pd carbene is supposed to be the key step for the reaction.
Transition-Metal-Free Synthesis of Pinacol Alkylboronates from Tosylhydrazones
作者:Huan Li、Long Wang、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201108139
日期:2012.3.19
Highly efficient: Pinacolalkylboronates were synthesized by the reaction of tosylhydrazones with bis(pinacolato)diboron or pinacolborane under transition‐metal‐free conditions. This reaction represents an expeditious conversion of carbonyl functionality into a boronate group.
C(sp)–C(sp<sup>3</sup>) Bond Formation through Cu-Catalyzed Cross-Coupling of<i>N</i>-Tosylhydrazones and Trialkylsilylethynes
作者:Fei Ye、Xiaoshen Ma、Qing Xiao、Huan Li、Yan Zhang、Jianbo Wang
DOI:10.1021/ja3004792
日期:2012.4.4
Copper-catalyzed cross-coupling of N-tosylhydrazones with trialkylsilylethynes leads to the formation of C(sp)-C(sp(3)) bonds. Cu carbene migratory insertion is proposed to play the key role in this transformation.
Palladium(0)-catalyzed C(sp<sup>3</sup>)–Si bond formation <i>via</i> formal carbene insertion into a Si–H bond
作者:Zhenxing Liu、Jingfeng Huo、Tianren Fu、Haocheng Tan、Fei Ye、Mohammad Lokman Hossain、Jianbo Wang
DOI:10.1039/c8cc06768f
日期:——
Pd(0)-Catalyzed formal carbene insertion into Si–H bonds has been achieved as an efficient method for C(sp3)–Si bond formation. The reaction, which uses readily available N-tosylhydrazones as the diazo precursors, is highly efficient and shows a wide substrate scope. Rh(II) and Cu(I) salts, which are the widely used catalysts for carbene insertion reactions, have been proved to be ineffective for the