Sustainable Synthesis of Diverse Privileged Heterocycles by Palladium-Catalyzed Aerobic Oxidative Isocyanide Insertion
作者:Tjøstil Vlaar、Razvan C. Cioc、Pieter Mampuys、Bert U. W. Maes、Romano V. A. Orru、Eelco Ruijter
DOI:10.1002/anie.201207410
日期:2012.12.21
O2 in, H2O out: Various diamines and related bisnucleophiles readily undergo oxidativeisocyanideinsertion with Pd(OAc)2 (1 mol %) as the catalyst and O2 as the terminal oxidant to give a diverse array of medicinally relevant N heterocycles. The utility of this highly sustainable method is demonstrated by a formal synthesis of the antihistamines astemizole and norastemizole.
O 2 in,H 2 O out:各种二胺和相关的双亲核试剂易于经历氧化异氰化物的插入,其中Pd(OAc)2(1 mol%)作为催化剂,O 2作为末端氧化剂,可得到多种与医学相关的N杂环。抗组胺药阿司咪唑和去甲阿司咪唑的正式合成证明了这种高度可持续性方法的实用性。
Synthesis of Diverse Nitrogen Heterocycles <i>via</i>
Palladium-Catalyzed Tandem Azide-Isocyanide Cross-Coupling/Cyclization: Mechanistic Insight using Experimental and Theoretical Studies
作者:Arshad J. Ansari、Ramdas S. Pathare、Antim K. Maurya、Vijai K. Agnihotri、Shahnawaz Khan、Tapta Kanchan Roy、Devesh M. Sawant、Ram T. Pardasani
DOI:10.1002/adsc.201700928
日期:2018.1.17
A rapid and elegant tandem azide–isocyanide cross‐coupling/cyclization protocol has been developed based on a nitrene transfer reaction. The palladium‐catalyzed ligand‐free methodology led to the synthesis of three different heterocyclic scaffolds with excellent atom/step/redox economy. Studies based on first‐principles‐based quantum calculations and control experiments unraveled a concerted process
Amine Activation:<i>N</i>-Arylamino Acid Amide Synthesis from Isothioureas and Amino Acids
作者:Yan-Ping Zhu、Pieter Mampuys、Sergey Sergeyev、Steven Ballet、Bert U. W. Maes
DOI:10.1002/adsc.201700134
日期:2017.7.17
functional group compatibility, with respect to side chain functionality of the amino acid (e. g. aliphatic and aromatic OH, (hetero)aromatic NH, amide NH, thioether), and the chiral amino acids do not undergo epimerization. The mechanism of the new amidesynthesis has been studied.
Palladium-catalyzed cross-coupling reaction of azides with isocyanides
作者:Zhen Zhang、Zongyang Li、Bin Fu、Zhenhua Zhang
DOI:10.1039/c5cc05981j
日期:——
A palladium-catalyzed cross-coupling reaction of azides with isocyanides is developed, providing a general synthetic route to unsymmetric carbodiimides.
β-Diketiminato Nickel Imides in Catalytic Nitrene Transfer to Isocyanides
作者:Stefan Wiese、Mae Joanne B. Aguila、Elzbieta Kogut、Timothy H. Warren
DOI:10.1021/om300909n
日期:2013.4.22
organoazides N3R with isocyanides R′NC. [Me3NN]Ni(CNR)2 (R = tBu, Ar (Ar = 2,6-Me2C6H3)) species provide carbodiimides RN═C═NAr′ upon reaction with Ar′N3 (Ar′ = 3,5-Me2C6H3). Nitrene transfer takes place via the intermediacy of nickel imides. Reaction of [MexNN]Ni(2-picoline) (x = 2 or 3) with Ar′N3 gives the new dinickel imides [MexNN]Ni}2(μ-NAr′) (4 (x = 3) and 5 (x = 2)) as deep purple, diamagnetic
β-二酮亚胺基镍(I)物种[Me 3 NN] Ni(2-picoline)(1)在一系列有机叠氮化物N 3 R的反应中用作碳二亚胺(RN═C═NR')形成的有效催化剂与异氰酸酯R'NC。[Me 3 NN] Ni(CNR)2(R = t Bu,Ar(Ar = 2,6-Me 2 C 6 H 3))物种在与Ar'N 3(Ar ′= 3,5-Me 2 C 6 H 3)。乙二胺的中间发生转移。[Me x NN] Ni(2-picoline)(x= 2或3)和Ar'N 3产生新的二镍酰亚胺[Me x NN] Ni} 2(μ-NAr')(4(x = 3)和5(x = 2))为深紫色,反磁性物质。[Me 2 NN] Ni} 2(μ-NAr')(5)的X射线结构具有短的Ni-N酰亚胺距离,分别为1.747(2)和1.755(2)Å,以及短的Ni-Ni距离2.7210(3)Å。这些二镍酰亚胺4和5与t B