Cobalt-catalyzed acceptorless dehydrogenative coupling of aminoalcohols with alcohols: direct access to pyrrole, pyridine and pyrazine derivatives
作者:Siba P. Midya、Vinod G. Landge、Manoj K. Sahoo、Jagannath Rana、Ekambaram Balaraman
DOI:10.1039/c7cc07427a
日期:——
example is reported of a new, molecularly defined SNS-cobalt(II) catalyst for the acceptorless dehydrogenative coupling (ADC) of unprotected amino alcohols with secondary alcohols leading to pyrrole and pyridinederivatives.
PHOSPHINE FREE COBALT BASED CATALYST, PROCESS FOR PREPARATION AND USE THEREOF
申请人:COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
公开号:US20200384451A1
公开(公告)日:2020-12-10
The present invention discloses a phosphine free cobalt based catalyst of formula (I) and a process for preparation thereof. The present invention further discloses a process for the synthesis of aromatic heterocyclic compounds of formula (II) and pyrazine derivative using the phosphine free cobalt based catalyst of formula (I).
Herein, we demonstrate the first nickel-catalyzed double dehydrogenative condensation of secondaryalcohols and β-amino alcohols in one pot to the pyrrole derivatives. A series of 2,5- and 2,3,5-substituted pyrroles were obtained in ≤83% yield, releasing water and hydrogen gas as byproducts. Initial mechanistic studies, including defined Ni catalyst, deuterium labeling experiments, quantitative determination
A pincer-type Ru(II)-NNP complex bearing a pyrazolyl-(NH-PtBu2)-pyridine ligand was synthesized and structurally characterized by NMR, IR, elemental analysis, and X-ray single-crystal crystallographic determinations, which efficiently catalyzed the synthesis of multisubstituted pyrroles and pyridines by means of the reactions of secondary alcohols and β- or γ-amino alcohols through deoxygenation and
合成了带有吡唑基-(NH-P t Bu 2)-吡啶配体的钳型Ru(II)-NNP络合物,并通过NMR,IR,元素分析和X射线单晶晶体学测定对其结构进行了表征,通过仲醇与β-或γ-氨基醇的脱氧反应以及选择性C–N和C–C键的形成,有效地催化了多取代吡咯和吡啶的合成。偶联反应以0.3mol%的催化剂负载量和容许的各种官能团进行。本工作提供了一种从容易获得的配体中构建高活性过渡金属配合物催化剂的替代方法。
General Transition Metal-Free Synthesis of NH-Pyrroles from Secondary Alcohols and 2-Aminoalcohols
作者:Besir Krasniqi、Kayle Geerts、Wim Dehaen
DOI:10.1021/acs.joc.8b03215
日期:2019.5.3
A novel, transition metal-free and one-pot methodology to synthesize various substituted NH-pyrroles from readily available building blocks such as secondary alcohols and 2-aminoalcohols is described. The process is based on the venerable Oppenauer–Woodward oxidation, which uses benzophenone as an inexpensive reagent to achieve oxidation of secondary alcohols under mild condition to ketones, further