An efficient synthesis of highlysubstitutedisoquinoliniumsalts from ketimines and alkynes via a Rh(III)-catalyzed C-H bond activation and annulation reaction is described.
Oxo/imido heterometathesis of N-sulfinylamines and carbonyl compounds catalyzed by silica-supported vanadium oxochloride
作者:Pavel A. Zhizhko、Anton A. Zhizhin、Dmitry N. Zarubin、Nikolai A. Ustynyuk、Dmitry A. Lemenovskii、Boris N. Shelimov、Leonid M. Kustov、Olga P. Tkachenko、Gayane A. Kirakosyan
DOI:10.1016/j.jcat.2011.07.011
日期:2011.10
with a higher vanadium content are contaminated with a significant amount of d1 vanadium species. The silica-supported vanadium complexes act as heterogeneous catalysts for oxo/imido heterometathesis between N-sulfinylamines and carbonyl compounds affording imines and SO2. Grafting VOCl3 onto silica leads to a dramatic enhancement of its catalytic activity. A novel water-free express method for preparation
通过无水接枝VOCl 3到二氧化硅表面上,制备了一系列二氧化硅负载的钒氧杂配合物。获得的材料已通过拉曼,漫反射FTIR(DRIFT)和UV-vis,51 V固态NMR和X射线光电子能谱,元素分析和N 2物理吸附进行了表征。发现低钒含量(1-5%)的样品主要由分离的四面体d 0单元(SiO)V(O)Cl 2组成,而钒含量较高的材料则被显着污染。 d 1的量钒物种。二氧化硅负载的钒络合物充当N-亚磺酰基胺与提供亚胺和SO 2的羰基化合物之间的羰基/亚胺基异位复分解反应的非均相催化剂。将VOCl 3接枝到二氧化硅上可大大提高其催化活性。已开发出一种新型的无水表达方法,用于制备多种醛和某些酮的亚胺。值得注意的是,这是过渡金属介导的酮的异复酰亚胺化的第一个例子。
Synthesis of Benzo[<i>b</i>]fluoranthenes and Spiroacridines from Fluorene-Derived Alkenes and <i>N</i>-Arylimines via a Tandem Reaction with Benzynes
作者:Weihua Wang、Hongwei Wan、Guangfen Du、Bin Dai、Lin He
DOI:10.1021/acs.orglett.9b00659
日期:2019.5.17
Two tandem processes involving the cycloaddition of benzynes have been developed for the synthesis of polyaromatic hydrocarbons. Benzynes react with fluorene-derived alkenes through a tandem Diels–Alder reaction/dehydrogenation process to afford benzo[b]fluoranthenes in 35–87% yields. In addition, an unprecedented [2 + 2] cycloaddition/ring-opening sequence of benzynes and fluorene-derived N-arylimines
已经开发了涉及联苯的环加成的两个串联方法来合成聚芳族烃。通过串联Diels-Alder反应/脱氢过程,苯并zy与芴衍生的烯烃反应,以35-87%的收率得到苯并[ b ]芴。此外,前所未有的[2 + 2]苯并炔和芴衍生的N-芳基嘧啶的环加成/开环顺序可轻松获得螺cr啶,收率为38-79%。
Preparation of Methoxy-substituted Diaryl Ketone Anils<i>via</i>Phenyliminodimagnesium Intermediate
作者:Masao Okubo、Sonoko Ueda
DOI:10.1246/bcsj.53.281
日期:1980.1
Phenyliminodimagnesium reagent (PhN(MgBr)2) and its o- and p-methoxy derivatives, prepared in THF by treatment of anilines with EtMgBr, were found to be effective for condensation with benzophenones and fluorenone. The corresponding anils (N-(diarylmethylene)anilines) were prepared in good yields.
Tungsten Oxide Dispersed on Silica as Robust and Readily Available Oxo/Imido Heterometathesis Catalyst
作者:Nikolai S. Bushkov、Andrey V. Rumyantsev、Anton A. Zhizhin、Tatyana V. Strelkova、Roman A. Novikov、Evgenii I. Gutsul、Rina U. Takazova、Dinara K. Kitaeva、Nikolai A. Ustynyuk、Pavel A. Zhizhko、Dmitry N. Zarubin
DOI:10.1002/cplu.202400029
日期:2024.8
Tungstenoxide dispersed on silica (WO3/SiO2), robust and widely used industrial material, was shown to be an efficient oxo/imido heterometathesis catalyst and applied for the preparation of ketimines hardly accessible by classical methods demonstrating the performance competitive with the previously reported highly sensitive catalysts prepared via Surface Organometallic Chemistry.