Easily accessible lithium compound catalyzed mild and facile hydroboration and cyanosilylation of aldehydes and ketones
作者:Milan Kumar Bisai、Tamal Das、Kumar Vanka、Sakya S. Sen
DOI:10.1039/c8cc02314j
日期:——
dilithioferrocene (1b) and nacnac lithium (1c) are found to be efficient single site catalysts for hydroboration of a range of aldehydes and ketones with HBpin at room temperature. The efficacy of 1a–1c as catalysts is extended to the cyanosilylation of aldehydes and ketones with Me3SiCN.
Upon light-induced isomerization, diarylethenes (DAEs) equipped with reactive aldehyde moieties rearrange selectively in the presence of amines, accompanied by decoloration. In a comprehensive study, the probe structure was optimized with regard to its inherent reactivity in the nucleophile-triggered rearrangement reaction. Detailed structure-reactivity relationships could be derived, in particular
Hydroborative reduction of amides to amines mediated by La(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>
作者:Fangcao Zhang、Chenjun Guo、Mingliang Gong、Hongzhen Xie、Yunjie Luo
DOI:10.1039/d1nj04996h
日期:——
amides to amines is a great challenge for resonance-stabilized carboxamide moieties, although this synthetic strategy is an attractive approach to access the corresponding amines. La(CH2C6H4NMe2-o)3, a simple and easily accessible lanthanide complex, was found to be highly efficient not only for secondary and tertiary amide reduction, but also for the most challenging primary reduction with pinacolborane
酰胺脱氧还原为胺对于共振稳定的羧酰胺部分是一个巨大的挑战,尽管这种合成策略是获得相应胺的有吸引力的方法。La(CH 2 C 6 H 4 NMe 2 - o ) 3是一种简单易得的镧系元素络合物,被发现不仅对于仲酰胺和叔酰胺还原非常有效,而且对于频哪硼烷最具挑战性的初级还原也是如此。该方案对许多官能团和杂原子表现出良好的耐受性,可应用于克级合成。该催化循环中的活性物质可能是镧系元素氢化物。
Electrostatic Catalyst Generated from Diazadiborinine for Carbonyl Reduction
hydroboration reactions of carbonyl compounds and CO2 catalyzed by aromatic diazadiborinine. A joint experimental and computational study on the reaction mechanism suggests that adducts of diazadiborinine with carbonyl and CO2 formed at the initial stage of the reactions serve as actual catalysts. The former stabilizes the transition state by using the electrostatic interaction between the hydride of
Pincer‐Supported Gallium Complexes for the Catalytic Hydroboration of Aldehydes, Ketones and Carbon Dioxide
作者:Lingyu Liu、Siu‐Kwan Lo、Cory Smith、Jose M. Goicoechea
DOI:10.1002/chem.202103009
日期:2021.12.9
novel gallium hydride complexes supported by an N,N-bis(3,5-di-tert-butyl-2-phenoxy)amine pincer ligand is described and their activity as catalysts for the catalytic reduction of aldehydes, ketones and carbondioxide is explored.