Designed pincer ligand supported Co(<scp>ii</scp>)-based catalysts for dehydrogenative activation of alcohols: Studies on <i>N</i>-alkylation of amines, α-alkylation of ketones and synthesis of quinolines
作者:Anshu Singh、Ankur Maji、Mayank Joshi、Angshuman R. Choudhury、Kaushik Ghosh
DOI:10.1039/d0dt03748f
日期:——
Base-metal catalysts Co1, Co2 and Co3 were synthesized from designed pincerligands L1, L2 and L3 having NNN donor atoms respectively. Co1, Co2 and Co3 were characterized by IR, UV–Vis. and ESI-MS spectroscopic studies. Single crystal X-ray diffraction studies were investigated to authenticate the molecular structures of Co1 and Co3. Catalysts Co1, Co2 and Co3 were utilized to study the dehydrogenative
RhCl(CO)(PPh 3 ) 2 catalyzed α-alkylation of ketones with alcohols
作者:Rui Wang、Lina Huang、Zhengyin Du、Hua Feng
DOI:10.1016/j.jorganchem.2017.05.055
日期:2017.10
A simple and efficient method for α-alkylation of ketones with primary alcohols catalyzed by RhCl(CO)(PPh3)2 without additional additives under mild conditions is developed. It has a wide substrate scope, high atom-efficiency and chemoselectivity. It is an environmentally friendly method to build CC bond because water is the only byproduct.
BINAP-copper supported by hydrotalcite as an efficient catalyst for the borrowing hydrogen reaction and dehydrogenation cyclization under water or solvent-free conditions
作者:Zhaojun Xu、Xiaoli Yu、Xinxin Sang、Dawei Wang
DOI:10.1039/c8gc00557e
日期:——
A BINAP-Cu system supported by hydrotalcite has been developed and proved to be a highlyefficientcatalyst for the atom-efficient and green borrowing hydrogen reaction and dehydrogenative cyclization. This BINAP-Cu complex supported by hydrotalcite is highly air-stable and can be recycled at least five times under solvent-free conditions. Notably, 1-benzyl-2-aryl-1H-benzo[d]imidazole derivatives could
已经开发了由水滑石支撑的BINAP-Cu系统,并被证明是一种高效的催化剂,用于原子效率高的绿色借入氢反应和脱氢环化反应。这种由水滑石负载的BINAP-Cu络合物具有高度的空气稳定性,在无溶剂条件下可以循环至少五次。值得注意的是,第一次以水为溶剂仅一步即可由醇合成1-苄基-2-芳基-1 H-苯并[ d ]咪唑衍生物。这为在水或无溶剂条件下以高收率合成官能化的胺,酮和1-苄基-2-芳基-1 H-苯并[ d ]咪唑衍生物提供了一种更加绿色有效的催化方法。
RuHCl(CO)(PPh<sub>3</sub>)<sub>3</sub>-Catalyzed α-Alkylation of Ketones with Primary Alcohols
作者:Takashi Kuwahara、Takahide Fukuyama、Ilhyong Ryu
DOI:10.1021/ol302145a
日期:2012.9.21
reaction of ketones with primary alcohols to give α-alkylated ketones was achieved using RuHCl(CO)(PPh3)3 as a catalyst in the presence of Cs2CO3 as a base. This reaction proceeds via an aldol condensation of ketones with aldehydes, formed via transfer dehydrogenation of alcohols, to give α,β-unsaturated ketones, which then undergo transfer hydrogenation with primary alcohols to give α-alkylated ketones
在Cs 2 CO 3为碱的情况下,使用RuHCl(CO)(PPh 3)3作为催化剂,实现了酮与伯醇的α-烷基化反应以生成α-烷基化的酮。该反应通过酮与醛的醛醇缩合缩醛进行,通过醇的转移脱氢反应形成,得到α,β-不饱和酮,然后与伯醇进行转移氢化,得到α-烷基化的酮和醛,后者参与其中。在下一个催化循环中。尽管脂族伯醇的反应比苯甲醇的反应慢,但发现催化量的1,10-菲咯啉可显着促进烷基化。
Heterogenized manganese catalyst for C-, and N-alkylation of ketones and amines with alcohols by pyrolysis of molecularly defined complexes
control on a molecular level. Herein, we set out the conversion of homogenous manganese complex into heterogeneous manganese-based catalyst via pyrolyzing the pre-formed crystalline polymer. The catalyst thus produced are then utilized for C–C/C–N bond-forming reactions, such as alkylation of ketones and/or amines, utilizing primary alcohols as an alkylating agent, under nearly mild conditions liberating