已开发出一种新的快速简便的方法,用于芳族醛和二醛与丙二腈和溴化氰的单锅反应,可在极短的时间内以极高的收率提供全取代的3-芳基环丙烷-1,1,2,2-四腈。大约5秒钟)。通过IR,1 H NMR,13 C NMR,质谱和X射线晶体学技术对结构进行了表征。对于这些化合物,晶体学数据在固体情况下在镜像中显示出两种结构,在溶液中显示出一种不同的结构。讨论了反应机理。
Flash preparation of carbenoids: A different performance of cyanogen bromide
作者:Mohammad Hedayati、Nader Pesyan
DOI:10.13005/ojc/300477
日期:2014.12.31
Cyanogen halides are known substances for the cyanating reaction. There are a few evidences for bromination reaction too. On the other hand carbenes are known as very important substances due to their remarkable reactions. Unfortunately carbenes at room temperature are very unstable and there is not a simple method for preparation of them. In most cases the isolation is not possible. We have reported a new reliable and fast preparation method of almost stable carbenoids. The mechanism of the formation has been discussed.
One-pot cascade assembling of 3-substituted tetracyanocyclopropanes from alkylidenemalononitriles and malononitrile by the only bromine direct action
作者:Anatolii N. Vereshchagin、Michail N. Elinson、Nikita O. Stepanov、Gennady I. Nikishin
DOI:10.1016/j.mencom.2009.11.010
日期:2009.11
The new cascade reaction was found: the formation of cyclopropanes from alkylidenemalononitriles and malononitrile by the only bromine direct action; the action of aqueous bromine on the equal amounts of alkylidenemalononitriles and malononitrile in EtOH–H 2 O solutions results in the formation of 3-substituted 1,1,2,2-tetracyanocyclopropanes in 55–98% yields.
A new type of cascade reaction: direct conversion of carbonyl compounds and malononitrile into substituted tetracyanocyclopropanes
作者:Michail N. Elinson、Anatolii N. Vereshchagin、Nikita O. Stepanov、Alexey I. Ilovaisky、Alexander Ya. Vorontsov、Gennady I. Nikishin
DOI:10.1016/j.tet.2009.05.062
日期:2009.8
A new type of chemical cascadereaction was found: the direct formation of cyclopropanes from carbonyl compounds and C–H acid. The action of free halogen or active halogen containing compounds on a mixture of 1 equiv of carbonyl compound and 2 equiv of malononitrile in a basic alcohol solution results in the formation of substituted 1,1,2,2-tetracyanocyclopropanes in 15–80% yield. The latter are well-known
A new strategy of the chemical route to the cyclopropane structure: direct transformation of benzylidenemalononitriles and malononitrile into 1,1,2,2-tetracyanocyclopropanes
作者:Michail N. Elinson、Sergey K. Feducovich、Nikita O. Stepanov、Anatolii N. Vereshchagin、Gennady I. Nikishin
DOI:10.1016/j.tet.2007.11.027
日期:2008.1
The new reaction was found: the direct formation of cyclopropanes from activated olefins and C–H acids. The action of free halogen or active halogen containing compounds on the equal amounts of benzylidenemalononitriles and malononitrile in basic alcohol solutions results in the formation of 3-aryl-1,1,2,2-tetracyanocyclopropanes in 65–95% yields. Thus, the new simple and efficient way to 3-aryl substituted
Cyclopropanation of electron-deficient alkenes and wideqvist-type synthesis of cyclopropanes mediated by indium metal
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1039/c39890001286
日期:——
Cyclopropanation of electron-deficientalkenes and Wideqvist-type transformation of carbonyl compounds to cyclopropanes have been achieved by the action of active methylene dibromides and metallic indium.