由于该官能团可能发生广泛的化学转化,因此炔烃是有吸引力的起始材料。现在报道了由烯还原酶催化的贫电子炔烃的选择性生物还原以产生( Z )-或( E )-烯烃。制备型生物转化以完全选择性进行,得到 ( Z )-氰基烯烃(分离收率 63-97%),因此类似于过渡金属(例如 Lindlar)催化剂所显示的活性。
Atom-Economic Route to Cyanoarenes and 2,2′-Dicyanobiarenes via Iron-Catalyzed Chemoselective [2 + 2 + 2] Cycloaddition Reactions of Diynes and Tetraynes with Alkynylnitriles
An efficient protocol for the synthesis of cyanoarenes has been developed via an iron-catalyzed chemoselective [2 + 2 + 2] cycloadditionreaction of diynes with alkynylnitriles under mild reaction conditions with good to excellent yields. The reaction is catalyzed by the combination of FeCl2·4H2O as a metal source, 2-(2,6-diisopropylphenyl)iminomethylpyridine (dipimp) as a ligand, and Zn as a reducing
Additive-Controlled Switchable Selectivity from Cyanobenzenes to 2-Alkynylpyridines: Ruthenium(II)-Catalyzed [2+2+2] Cycloadditions of Diynes and Alkynylnitriles
作者:Divya Bhatt、Neha Patel、Hrishikesh Chowdhury、Prasad V. Bharatam、Avijit Goswami
DOI:10.1002/adsc.201800228
日期:2018.5.2
developed by the reaction of 1,6‐diynes with alkynylnitriles using chloro(pentamethylcyclopentadienyl) (cyclooctadiyne)ruthenium(II) as catalyst in dimethoxyethane (DME). The course of the reaction can be drastically altered simply by adding a catalytic amount of AgOTf as an additive resulting in a comprehensive shift in product formation from cyanoarenes to 2‐alkynylpyridines. Theoreticalstudies clearly indicate
A copper-catalyzed reaction of terminal alkynes with cyanogen iodide (ICN) that produces alkynyl cyanides has been developed. The use of tetramethylpiperidine as a sterically congested base was successful in this reaction. Some control experiments revealed that the reaction involves the noncatalyzed formation of alkynyl iodides followed by copper-catalyzed cyanation of the iodides without the formation
Ionic Liquid-Mediated One-Pot 3-Acylimino-3<i>H</i>-1,2-dithiole Synthesis from Thiocarboxylic Acids and Alkynylnitriles via In Situ Generation of Disulfide Intermediates
作者:Chandresh Kumari、Avijit Goswami
DOI:10.1021/acs.joc.2c00301
日期:2022.7.1
derivatives via a metal-free annulationreaction of alkynylnitriles with thiocarboxylic acids mediated by ionic liquids [BMIM]Br has been reported. This operationally simple protocol offers an easy and rapid access to a library of dithiol derivatives in moderate to good yields. The mechanistic studies show a benzoyldithio anion addition to alkynylnitriles followed by an annulationreaction through the involvement
已经报道了一种实用且直接的策略,用于通过离子液体 [BMIM]Br 介导的炔基腈与硫代羧酸的无金属环化反应合成 3-acylimino-3 H -1,2-dithiol 衍生物。这种操作简单的协议提供了一种以中等至良好的产量轻松快速地访问二硫醇衍生物库的方法。机理研究表明,苯甲酰二硫代阴离子加成到炔基腈中,然后通过作为关键中间体的二硫化物部分参与环化反应。