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.
Electrochemical Transformation of Malononitrile and Carbonyl Compounds into Functionally Substituted Cyclopropanes: Electrocatalytic Variant of the Wideqvist Reaction
作者:Michail N. Elinson、Sergey K. Feducovich、Tatiana L. Lizunova、Gennady I. Nikishin
DOI:10.1016/s0040-4020(00)00195-2
日期:2000.5
Electrolysis of malononitrile and carbonyl compounds in the presence of alkali metal halides in an undivided cell results in the formation of substituted 1,1,2,2-tetracyanocyclopropanes in 60–90% yield. This electrocatalytic variant of the Wideqvist reaction using malononitrile instead of bromomalonitrile was successfully performed. Electrocatalytic transformation of substituted 1,1,2,2-tetracyanocyclopropanes
在不分开的电解槽中,在碱金属卤化物存在下,丙二腈和羰基化合物的电解导致取代的1,1,2,2-四氰基环丙烷的形成,产率为60-90%。使用丙二腈代替溴丙二腈成功进行了Wideqvist反应的这种电催化变体。在未分开的电池中,甲醇或乙醇中取代的1,1,2,2-四氰基环丙烷的电催化转化导致取代的2-氨基-4,4-二烷氧基-1,5-二氰基-3-氮杂双环[3.1.0] hex-通过0.05-0.10 F / mol的电量后,二烯的产率为70-95%。
Synthesis of Activated Cyclopropanes by MHIRC Strategy: A Facile and Efficient Approach to Spirocyclopropanes Using N-Halosulfonamides
作者:Ramin Ghorbani-Vaghei、Yaser Maghbooli
DOI:10.1055/s-0035-1561653
日期:——
the preparation of spirodicyanocyclopropylindanediones from indane-1,3-dione and 2-arylidenemalononitriles is reported. These reactions involve Michael addition, halogenation, and intramolecular ring-closing (MHIRC) reaction sequences. In this study, a one-pot, three-component reaction of two molecules of indane-1,3-dione with aromaticaldehydes for the synthesis of spirocyclopropylindanediones using
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