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%。
Metal-free synthesis of highly substituted quinolines under mild conditions
作者:Rakesh Natarajan、Peruparambil A. Unnikrishnan、Sandhya Radhamani、John P. Rappai、Sreedharan Prathapan
DOI:10.1016/j.tetlet.2016.05.091
日期:2016.7
Starting from easily accessible nitrones and acetylenes, a simple, metal free synthesis of substituted quinolines undermildconditions with high atom efficiency has been developed. Our method is flexible enough to introduce substituents regiospecifically at the 2,3,4,6,8-positions of the quinoline product.
Synthesis of mono-, bis-spiro- and dispiro-β-lactams and evaluation of their antimalarial activities
作者:Aliasghar Jarrahpour、Edris Ebrahimi、Erik De Clercq、Véronique Sinou、Christine Latour、Lamia Djouhri Bouktab、Jean Michel Brunel
DOI:10.1016/j.tet.2011.09.041
日期:2011.11
Some new mono-, bis-spiro- and dispiro-β-lactams have been synthesized from imines derived from 9H-fluoren-9-one and a ketene derived from 9H-xanthene-9-carboxylic acid or phenoxyaceticacid by a [2+2] cycloaddition reaction in good to excellent yields varying from 45 to 83%. The biological activity of these monocyclic β-lactams was successfully investigated against Plasmodium falciparum K14 resistant
某些新的单,双-螺和双-螺-β-内酰胺是由[9 H-芴-9-一]衍生的亚胺和由9 H -carboxylic吨9-羧酸或苯氧乙酸衍生的乙烯酮合成的[ [2 + 2]环加成反应的良好至优异收率从45%到83%不等。已成功研究了这些单环β-内酰胺类抗恶性疟原虫K14抗性菌株的生物学活性,该菌株的EC 50值高达5μM。
Nitrogen‐doped Graphitic Carbon Synthesized by Laser Annealing of Sumanenemonoone Imine as a Bowl‐shaped π‐Conjugated Molecule
Time for tuning: Nitrogen‐doped graphitic carbon was synthesized from a bowl‐shaped π‐conjugated compound bearing an imine moiety; this bowl‐shaped compound underwent carbonization through laser annealing while almost retaining the nitrogen/carbon ratio.