Cyclopropylamines from N,N-Dialkylcarboxamides and Grignard Reagents in the Presence of Titanium Tetraisopropoxide or Methyltitanium Triisopropoxide
作者:Armin de Meijere、Vladimir Chaplinski、Harald Winsel、Markus Kordes、Björn Stecker、Vesta Gazizova、Andrei I. Savchenko、Roland Boese、Farina Schill née Brackmann
DOI:10.1002/chem.201001550
日期:2010.12.10
Thirty‐three different N,N‐dialkyl‐ and N‐alkyl‐N‐phosphorylalkyl‐substituted carboxamides 9–17 were treated with unsubstituted as well as with 2‐alkyl‐, 2,2‐dialkyl‐, and 3‐alkenyl‐substituted ethylmagnesium bromides 6 in the presence of stoichiometric amounts of titanium tetraisopropoxide or methyltitanium triisopropoxide to furnish substitutedcyclopropylamines 20–25 in 20–98 % yield, depending
The reaction of imides and activated amides with phosphoranes provides a simple route to enamides, bis[alkenyl]amines, and enamines. Experiments to determine the scope and limitations of these reactions are summarised in this review. Some of the results are taken from investigations with other aims. As well as the dependance on structure, configurational and tautomeric aspects of the reaction are described. The Wittig alkenylation of the imides is compared with other methods of alkenylation. 1. Introduction 2. Wittig Alkenylation of Imides 2.1. General Comments 2.2. Non-Stabilised Phosphoranes 2.3. Ethoxycarbonylmethylenetriphenylphosphorane and Cyanomethylenetriphenylphosphorane 2.3.1. Open Chain Imides 2.3.2. Five-Membered Ring Imides: Phthalimides, Succinimides, and Maleimides 2.3.3. Six-Membered and Larger Ring Imides 2.3.4. Bicyclic N-Bridgehead Imides 2.3.5. N-Acylimides 2.4. Benzoylmethylenetriphenylphosphorane 3. Alkenylation of Imides with the Wittig-Horner Reagent 4. Alkenylation of Activated Amides 4.1. N-Sulfonyllactams 4.2. N-Acylpyrroles 5. Conclusions
Ozone and ozone/vacuum-UV degradation of diethyl dithiocarbamate collector: kinetics, mineralization, byproducts and pathways
作者:Pingfeng Fu、Yanhong Ma、Huifen Yang、Gen Li、Xiaofeng Lin
DOI:10.1039/c9ra04127c
日期:——
The diethyl dithiocarbamate collector, a precursor of toxic N-nitrosamines, can be effectively degraded by the O3/VUV with satisfactory mineralization extents.
Reaction of iodo(trimethyl)silane with N,N-dimethyl carboxylic acid amides
作者:M. G. Voronkov、I. P. Tsyrendorzhieva、A. V. Lis、V. I. Rakhlin
DOI:10.1134/s1070428010060035
日期:2010.6
(R = H, Me) at a molar ratio of 1: 2 involved mainly cleavage of the N-C(=O) bond with formation of up to 80% of N,N-dimethyltrimethylsilylamine Me3SiNMe2 and the corresponding acyl iodide RCOI. In the reaction with N,N-dimethylformamide, formyl iodide HCOI was detected for the first time by gas chromatography-mass spectrometry. The contribution of Me-N bond cleavage, leading to N-methyl-N-trimethylsilyl