涉及 1,n-金属迁移的催化反应代表了一种通过激活 CH 键从简单前体合成复杂分子的有效方法。通过利用这一吸引人的特征,我们设计了一种钯催化合成 5H-二苯并 [b,f] silepins 的新成员,这是一类尚未开发但可能有用的硅桥接 π 共轭化合物。The reaction sequence is composed of 1,n-palladium migrations and unusual anti-carbopalladation of alkynes, which was realized by the proper choice of ligand for palladium. 进行了一系列氘标记实验以了解反应机理,以提出合理的催化循环。新获得的 5H-二苯并[b,f] silepins 表现出可调的光学和电子特性,
Directing group: A Pd‐catalyzed aromaticCHoxygenation has been developed, featuring a modifiable silanol‐directing group. The resulting oxasilacycles can be efficiently modified into a variety of valuable building blocks (see scheme).
导向基团:已开发出Pd 催化的芳香族 C → H 氧化反应,具有可修饰的硅烷醇导向基团。所得的草硅环可以有效地修饰成各种有价值的结构单元(参见方案)。
Disiloxane Synthesis Based on Silicon–Hydrogen Bond Activation using Gold and Platinum on Carbon in Water or Heavy Water
that disiloxanes were effectively constructed of hydrosilanes catalyzed by gold on carbon in water as the solvent and oxidant in association with the emission of hydrogen gas at room temperature. The present oxidation could proceed via various reaction pathways, such as the hydration of hydrosilane into silanol, dehydrogenative coupling of hydrosilane into disilane, and the subsequent corresponding
Thermodynamic <i>versus</i> kinetic control in substituent redistribution reactions of silylium ions steered by the counteranion
作者:Lukas Omann、Bimal Pudasaini、Elisabeth Irran、Hendrik F. T. Klare、Mu-Hyun Baik、Martin Oestreich
DOI:10.1039/c8sc01833b
日期:——
theoretical study of the substituent exchange reaction of silyliumions is presented. Apart from the substitution pattern at the silicon atom, the selectivity of this process is predominantly influenced by the counteranion, which is introduced with the trityl salt in the silyliumion generation. In contrast to Müller's protocol for the synthesis of triarylsilylium ions under kinetic control, the use of Reed's
An access to 1,3-azasiline-fused quinolinones<i>via</i>oxidative heteroannulation involving silyl C(sp<sup>3</sup>)–H functionalization
作者:Li-Jun Wu、Yuan Yang、Ren-Jie Song、Jiang-Xi Yu、Jin-Heng Li、De-Liang He
DOI:10.1039/c7cc08996a
日期:——
A Mn-promoted intermolecular oxidative radical heteroannulation of N-(2-cyanoaryl)-acrylamides and tertiary silanes has been described, which provides an efficient route to produce silicon/nitrogen heterocycles, sila-analogues of the known carbon-based structural motifs prevalent in bioactive natural products, pharmaceuticals and materials. The reaction enables Si-incorporation by controlling accurately
Modular Synthesis of (Borylmethyl)silanes through Orthogonal Functionalization of a Carbon Atom
作者:Rajdip Chowdhury、Gábor Zoltán Elek、Beatriz Meana-Baamonde、Abraham Mendoza
DOI:10.1021/acs.orglett.3c00474
日期:2023.3.24
building blocks in organic synthesis displaying a unique reactivity. Yet, the synthesis of more advanced derivatives is limited by the advanced silicon intermediates required for their preparation. Herein, a one-pot synthesis of (borylmethyl)silanes is developed, sourced on available alkyl-, aryl-, alkoxy-, aryloxy-, and silyl-hydrosilane materials. The privileged reactivity of N-hydroxyphthalimidyl diazoacetate