Copper-catalyzed N–H insertion reactions from sulfoxonium ylides
作者:Lucas G. Furniel、Antonio C.B. Burtoloso
DOI:10.1016/j.tet.2020.131313
日期:2020.12
The first use of copper(II) as an efficient catalyst for N–H insertionreactions between anilines and α-carbonyl sulfoxoniumylides is described. Products, 39 arylglycine derivatives, were obtained in yields up to 97% employing a simple and fast experimental procedure.
Carbene transfer reactions play an important role in the field of organicsynthesis because of their ability to construct a variety of molecules. Herein, we reported on blue light-induced cyclopropenizations of N-tosylhydrazones in water, which avoids the use of expensive metal-based catalysts and toxic organic solvents. This metal-free and operationally simple methodology enable highly efficient cyclopropenizations
Metal‐free photochemical carbene‐transfer reactions of tosylhydrazones were developed under blue light irradiation at room temperature. This reaction constructs C−X (X=C, N, O, S) bonds and cyclopropanes from readily available and stable starting materials.
time-economical TfOH-catalyzed N–H insertion between anilines and α-alkyl and α-aryl-α-diazoacetates provides a straightforward approach to access unnatural α-amino esters, which readily undergo various transformations and can thus be used for the synthesis of pharmaceutically relevant molecules. The α-amino esters were obtained in moderate to excellent yields.
Hemin-Catalyzed, Cyclodextrin-Assisted Insertion of Carbenoids into NH Bonds
作者:Xiaofei Xu、Chang Li、Zhihao Tao、Yuanjiang Pan
DOI:10.1002/adsc.201500418
日期:2015.10.12
An aqueous hemin-catalyzed, cyclodextrin-assisted NH insertion reaction of α-diazo ester into aromatic amines is described here. This aqueous catalytic system showed good compatibility with various arylamines, with yields up to 96%. A size-controlled reaction phenomenon by different cyclodextrins (CDs) was also observed when ethyl diazoacetate (EDA) was used. The reaction mechanism was also preliminarily