Xantphos在1,4-二恶烷:叔戊醇溶剂体系中钯催化的酰胺化反应对咪唑并[4,5- b ]吡啶和咪唑并[4,5- b ]吡嗪的改进合成
摘要:
AbstractHerein an improved protocol for the synthesis of imidazo[4,5‐b]pyridines and imidazo[4,5‐b]pyrazines using a palladium‐catalyzed amidation that utilizes Xantphos as an ancillary phosphine ligand is reported. The use of a binary solvent system comprised of 1,4‐dioxane and tert‐amyl alcohol was crucial in eliminating unwanted by‐products.magnified image
Base-mediated cascade amidination/<i>N</i>-alkylation of amines by alcohols
作者:Chunyan Zhang、Zuyu Liang、Fenghong Lu、Xiaofei Jia、Guoying Zhang、Mao-Lin Hu
DOI:10.1039/d0cc04831c
日期:——
amidination/N-alkylation reaction of amines by alcohols has been developed. For the first time, nitriles have been identified as an efficient and benign water acceptor reagent in N-alkylation. Notably, the procedure tolerates a series of functional groups, such as methoxyl, halo, vinyl and hetero groups, providing a convenient method to construct different substituted diamino compounds, 15N labeled
sustainable or green reaction that has received a lot of attention in recent years and is preferentially catalyzed by Ir or Ru complexes is the alkylation of amines by alcohols. It is based on the borrowing hydrogen or hydrogen autotransfer concept. Herein, we report on the Co‐catalyzed alkylation of aromaticamines by alcohols. The reaction proceeds undermildconditions, and selectively generates monoalkylated
A new protocol for the alkylation of aromaticamines has been described using alcohols in the presence of SmI2 as a catalyst with the generation of water as the sole byproduct. The reaction proceeds under MW conditions and selectively generates monoalkylated amines. This protocol features a broad substrate scope and good functional-group tolerance with moderate to high yields.
amines are selectively obtained from low value starting materials using hydrogen and a non-noble metal-based catalyst. The reductive amination of aldehydes from nitroarenes or nitroalkanes is efficiently catalyzed by a well-defined diamino molybdenum sulfide cluster in a one-pot homogeneous reaction. The integrity of the molecular cluster catalyst is preserved along the process.
Direct Alkylation of Amines with Alcohols Catalyzed by Base
作者:Qiang-Qiang Li、Zu-Feng Xiao、Chuan-Zhi Yao、Hong-Xing Zheng、Yan-Biao Kang
DOI:10.1021/acs.orglett.5b02685
日期:2015.11.6
A base-catalyzed/promoted transition-metal-free direct alkylation of amines with alcohols has been developed, giving the desired amines in generally high yields from either aromatic or aliphatic alcohols. On the basis of the 1H NMR and in situ IR (React-IR) monitoring experiments, isotope-labeling experiments, as well as control experiments, a novel “hemiaminal” model is proposed to understand the
已经开发了胺与醇的碱催化/促进的无过渡金属的直接烷基化反应,从芳香族或脂族醇中以通常高收率得到所需的胺。在1 H NMR和原位红外(React-IR)监测实验,同位素标记实验以及对照实验的基础上,提出了一种新颖的“半血友病”模型以了解其机理,从而解释了该机理的形成。反应中“多余”的醛。