Manganese-Catalyzed C−H Annulation of Ketimines with Allenes: Stereoselective Synthesis of 1-Aminoindanes
作者:Chong Lei、Lijie Peng、Ke Ding
DOI:10.1002/adsc.201800465
日期:2018.8.6
A manganese‐catalyzed C−H annulation of ketimines with poly‐substituted ester‐activated allenes toward the synthesis of 1‐aminoindanes bearing two vicinal all‐substituted carbon stereocenters and an exocyclic double bond was developed. The reaction features high diastereoselectivity, high E/Z selectivity, 100% atom‐economy, broad substrate scope and good functional group tolerance.
Transition-Metal-Free Addition of Acetylenes to Ketimines: the First Base-Catalyzed Ethynylation of the C=N Bond
作者:Ivan A. Bidusenko、Elena Yu. Schmidt、Igor A. Ushakov、Boris A. Trofimov
DOI:10.1002/ejoc.201800850
日期:2018.9.23
The base‐catalyzed addition of acetylenes to the C=N bond has been developed. The reaction proceeds smoothly in the KOBut/DMSO superbase system, which allows the activated ethynide anions in sufficient concentrations to be generated. The synthesis opens a simple transition metal‐free access to large series of acetylenic amines, valuable building blocks and precursors for drug design.
已经开发了碱催化的乙炔向C = N键的加成反应。反应在KOBu t / DMSO超碱系统中进行得很顺利,可以生成足够浓度的活化乙炔阴离子。合成过程使人们无需使用过渡金属即可轻松获得大量乙炔胺,有价值的结构单元和药物设计的前体。
A Highly Enantioselective Lewis Basic Organocatalyst for Reduction of <i>N</i>-Aryl Imines with Unprecedented Substrate Spectrum
作者:Zhouyu Wang、Xiaoxia Ye、Siyu Wei、Pengcheng Wu、Anjiang Zhang、Jian Sun
DOI:10.1021/ol060112g
日期:2006.3.2
L-Pipecolinic acid derived formamides have been developed as highly efficient and enantioselective Lewis basic organocatalysts for the reduction of N-aryl imines with trichlorosilane. Catalyst 4b afforded high isolated yields (up to 98%) and enantioselectivities (up to 96%) under mild conditions with an unprecedented substrate spectrum.
An efficient method for the synthesis of quinoxaline N‐oxides proceeds by the dehydrogenative N‐incorporation of simple imines by C(sp2)H and C(sp3)H bond functionalization. The overall transformation involves the cleavage of three CH bonds. The reaction is easily handled and proceeds undermildconditions. Simple and readily available tert‐butyl nitrite (TBN) was employed as the NO source.
Heterogeneous intermolecular hydroamination of terminal alkynes with aromatic amines
作者:Ganapati V. Shanbhag、Suresh M. Kumbar、Trissa Joseph、Shivappa B. Halligudi
DOI:10.1016/j.tetlet.2005.11.001
日期:2006.1
Heterogeneous intermolecular hydroamination of alkynes with aromatic amines using inexpensive transition metal-exchanged clay catalysts was investigated. Reaction of terminalalkynes with aromatic amines gave higher yields of imines.