在3,5-二苯基吡啶轴向配体存在的情况下,基于Co II /卟啉的大环作为内位配体,通过自由基-卡宾-转移反应,指导重氮和苯乙烯半螺纹中[2]轮烷的组装,产率高达95%。本文报道的方法采用了活性金属模板策略,包括在有机金属过程中通过金属模板离子对配体进行自由基型活化。对轮烷自组装反应提供的产物分布进行仔细的定量分析表明,Co II/卟啉亚基在形成机械键后仍然有效,并且在与其他重氮半螺纹衍生物配位后,会促进新型的C-H互插入反应,从而产生新的轮烷样物质。这种出乎意料的C–H中间插入说明了通过机械键带给Co II /卟啉酸酯催化剂的独特反应性。
Process for the preparation of substituted pyridines via
申请人:DSM N.V.
公开号:US05438143A1
公开(公告)日:1995-08-01
Process for the preparation of substituted pyridines by allowing 1-aza-1,3-butadienes to react, in the presence of a catalytic amount of secondary amine and acid, with an aldehyde or ketone, and new 1-aza-1,3-butadienes which are used in this process. Said pyridines can be obtained in high yield in a simple process with a short reaction time. The 1-aza-1,3-butadiene can, if so desired, be prepared in situ from an imine and an aldehyde.
Synthesis of Alkyl- and Aryl-Substituted Pyridines from (α,β-Unsaturated) Imines or Oximes and Carbonyl Compounds
作者:Robert J. Vijn、Henricus J. Arts、Richard Green、Anna M. Castelijns
DOI:10.1055/s-1994-25526
日期:——
Reaction of a variety of (α,β-unsaturated) imines or oximes with aliphatic aldehydes or cyclic ketones in the presence of a secondary amine afforded alkyl-, and/or aryl-, and/or cycloalkyl-substituted pyridines.1 To explain their formation, a hetero Diels-Alder reaction has been postulated, in which an 1-aza-1,3-butadiene reacts with an in situ generated enamine.
While numerous organo(metallic)catalyst systems were documented for dearomative hydroboration of N‐aromatics, alkoxide base catalysts have not been disclosed thus far. Described herein is the first example of alkoxide‐catalyzed hydroboration of N‐heteroaromatics including pyridines, providing a broad range of reduced N‐heterocycles with high efficiency and selectivity. Mechanistic studies revealed
[EN] PREPARATION OF AMINO ACIDS AND AMINO ACID DERIVATIVES<br/>[FR] PRÉPARATION D'ACIDES AMINÉS ET DE DÉRIVÉS D'ACIDES AMINÉS
申请人:MATERIA INC
公开号:WO2018057290A1
公开(公告)日:2018-03-29
The invention relates to a method for synthesizing amino acids or amino acid derivatives involving cross metathesis of functionalized olefins and a tandem amination-reduction process. Amino acids and amino acid derivatives present many interesting physical and chemical properties finding many uses in the automotive, fuel, electronic, and textile industries.
Use of the Curtius Rearrangement of Acryloyl Azides in the Synthesis of 3,5-Disubstituted Pyridines: Mechanistic Studies
作者:Ta-Hsien Chuang、Yu-Chi Chen、Someshwar Pola
DOI:10.1021/jo101394c
日期:2010.10.1
A series of disubstituted pyridine derivatives was synthesized from the corresponding acryloyl azides by acetic acid-promoted cycloaddition. This represents a novel and convenient synthetic approach to the symmetric 3,5-disubstituted pyridines. The nature of the substituent on the double bond and the utilized solvent were found to be crucial to the yield of pyridines. The reactivity of the acid-promoted