The 4.4′-benzidine rearrangement of 4-alkyl substituted hydrazobenzenes
作者:Marc E. Bouillon、Hartmut H. Meyer
DOI:10.1016/j.tet.2016.03.103
日期:2016.6
When treated with dilute inorganic acids N,N′-diarylhydrazines (hydrazobenzenes) with an alkyl substituent in the 4-position undergo [5,5]-sigmatropic rearrangement reactions to furnish 4-(4′-aminophenyl)-4-alkylcyclohexa-2,5-dienimines (ipso-benzidines) in moderate to excellent yields. Steric bulk of the 4-alkyl substituent in the starting material decreases the yield of the respective ipso-benzidine
Convenient semihydrogenation of azoarenes to hydrazoarenes using H<sub>2</sub>
作者:Manoj K. Sahoo、Ganesan Sivakumar、Sanjay Jadhav、Samrin Shaikh、Ekambaram Balaraman
DOI:10.1039/d1ob00850a
日期:——
The high atom-economical and eco-benign nature of hydrogenation reactions make them much more superior to conventional reduction and transferhydrogenation. Herein, a convenient and highly selective hydrogenation reaction of azoarenes using molecular hydrogen to access diverse hydrazoarenes is reported. The present catalytic method is general and operationally simple, and it operates under exceedingly
We report an efficient method for the oxidativedehydrogenation of hydrazines and diarylamines in aqueous ethanol using Anderson-type polyoxomolybdate-based iron(III) as a catalyst and hydrogen peroxide as an oxidant. A series of azo compounds and tetraarylhydrazines were obtained in moderate to excellent yields. The reaction conditions and substrate scopes are complementary or superior to those of
我们报告了一种使用安德森型多氧钼酸铁 ( III ) 作为催化剂和过氧化氢作为氧化剂在乙醇水溶液中氧化脱氢肼和二芳基胺的有效方法。以中等至极好的收率获得了一系列偶氮化合物和四芳基肼。反应条件和底物范围补充或优于更成熟的方案。此外,该催化剂在水中表现出良好的稳定性和重复使用性。初步的机理研究表明,该反应涉及一个自由基过程。
Tributyltin hydride when reacted with a series of substituted azoarenes afforded hydrazo compounds with high chemoselectivity and good to high yields. With ortho-substituted azoarenes, mixtures of hydrazo derivatives and N-heterocycles or cyclic products only were obtained. The kinetic law of the process was determined in the presence and in the absence of AIBN; with the radical initiator the reaction proceeds via a radical chain mechanism, whereas without AIBN the presence of stannyl free radicals could be discarded. The mechanism of the noninitiated reaction is discussed. EPR characterization of spin adducts obtained by reacting group IVB organometallic radicals with azo compounds is reported.
Compound Having Amino Acid Residue or Peptide Residue and Process for Producing the Same
申请人:Ikeda Hisafumi
公开号:US20080234464A1
公开(公告)日:2008-09-25
An object of the present invention is to provide a compound with a structure wherein amino acid or oligopeptide side chains are bonded to a main chain.
The present invention provides a compound represented by the following formula (1).
wherein n1 to n3, and m1 to m6 are certain integers;
Y is a hydroxyl or an amino group;
E is N or CH;
R is an amino acid residue, or a peptide residue consisting of 2 to 100 amino acid residues; and
L is a hydrogen atom, a group containing a lipid group, a group containing a fatty acid residue, or a group containing a fluorescent group.