Trapping Formaldehyde in the Homogeneous Catalytic Reduction of Carbon Dioxide
作者:Sébastien Bontemps、Sylviane Sabo-Etienne
DOI:10.1002/anie.201304025
日期:2013.9.23
Formaldehyde detectives: Evidence for the production of formaldehyde during a ruthenium‐catalyzed CO2 reduction process, and for its involvement in the formation of the resulting C2 compound, is disclosed. Ultimately, formaldehyde can be recovered by methanol trapping. HBPin=pinacolborane.
One and two: The C2compound pinBOCH2OCHO (see scheme; HBpin=pinacolborane) and several C1compounds have been obtained from the borane‐mediated reduction of CO2 under mild conditions with the catalyst precursor [RuH2(H2)2(PCy3)2]. Mechanistic investigation highlights the role of a series of new carbonyl ruthenium complexes that were characterized by multinuclear NMR spectroscopy, IR spectroscopy,
molecule, remains an elementary C1 building block to be observed. Herein we report the direct observation of free formaldehyde from the borane reduction of CO2 catalyzed by a polyhydride ruthenium complex. Guided by mechanistic studies, we disclose the selective trapping of formaldehyde by in situ condensation with a primary amine into the corresponding imine in very mild conditions. Subsequent hydrolysis
Bicyclic (alkyl)(amino)carbene (BICAAC) in a dual role: activation of primary amides and CO<sub>2</sub>towards catalytic<i>N</i>-methylation
作者:Nimisha Gautam、Ratan Logdi、Sreejyothi P.、Antara Roy、Ashwani K. Tiwari、Swadhin K. Mandal
DOI:10.1039/d3sc01216f
日期:——
Herein, we report the first catalytic methylation of primary amides using CO2 as a C1 source. A bicyclic (alkyl)(amino)carbene (BICAAC) exhibits dual role by activating both primary amide and CO2 to carry out this catalytic transformation which enables the formation of a new C–N bond in the presence of pinacolborane. This protocol was applicable to a wide range of substrate scopes, including aromatic
在此,我们报告了使用 CO 2作为 C1 源的伯酰胺的首次催化甲基化。双环(烷基)(氨基)卡宾 (BICAAC) 通过激活伯酰胺和 CO 2来进行这种催化转化,从而在频哪醇硼烷存在下形成新的 C-N 键,从而发挥双重作用。该协议适用于范围广泛的底物范围,包括芳香族、杂芳族和脂肪族酰胺。我们成功地将此程序用于药物和生物活性分子的多样化。此外,还探索了使用13 CO 2进行同位素标记的该方法对于一些生物学上重要的分子。在光谱研究和 DFT 计算的帮助下对该机制进行了详细研究。