“On water” palladium catalyzed diastereoselective boronic acid addition to structurally diverse cyclopropane nitriles
作者:Dwaipayan Das、Prasun Mukherjee、Asish R. Das
DOI:10.1039/d0ob00077a
日期:——
An efficient palladium catalyzeddiastereoselective addition of arylboronic acids to complex spirocyclopropyl dinitriles is developed in the presence of a catalytic amount of 4-dodecylbenzenesulphonic acid (DBSA) as a Brønstedacid surfactant in aqueousmedia. The protocol is also found to be highly effective when different types of nitrile compounds and organo-boron compounds are used. The overall
Pyridinium bromide as a mediator in electrochemical reactions: the preparation of cyclopropane-1,1-dicarbonitriles
作者:Anatoly N. Vereshchagin、Evgeniya O. Dorofeeva、Michail N. Elinson、Mikhail P. Egorov
DOI:10.24820/ark.5550190.p011.041
日期:——
Pyridinium bromide has been tested as a new mediator for electrochemical transformations in methanol and acetonitrile. An efficient protocol for the synthesis of cyclopropanes via the electrochemical transformations of alkylidenemalononitriles and C-H acids (malononitrile, malonic ester, N,N-dimethylbarbituric acid, pyrazolin-5-ones) has been developed. The chemistry proceeds in a simple undivided
Electrocatalytic and chemical methods in MHIRC reactions: the first example of the multicomponent assembly of medicinally relevant spirocyclopropylbarbiturates from three different molecules
作者:Anatolii N. Vereshchagin、Michail N. Elinson、Evgeniya O. Dorofeeva、Nikita O. Stepanov、Tatiana A. Zaimovskaya、Gennady I. Nikishin
DOI:10.1016/j.tet.2012.12.029
日期:2013.2
Electrolysis of aldehydes, barbituric acids, and malononitrile in alcohol in an undivided cell in the presence of sodium bromide results in efficient MHIRC formation of the corresponding spirocyclopropylbarbiturates in 50-65% substance yield. The electrocatalytic reaction smoothly proceeds under neutral and mild conditions with aromatic aldehydes bearing both electron-donating and electron-withdrawing groups. The implication of electrocatalysis in MHIRC reaction is an efficient approach to medicinally relevant spirocyclopropylbarbiturates avoiding the inconvenient direct use of molecular halogen or halogenated substrates. (C) 2012 Elsevier Ltd. All rights reserved.
The first example of the cascade assembly of a spirocyclopropane structure: direct transformation of benzylidenemalononitriles and N,N′-dialkylbarbituric acids into substituted 2-aryl-4,6,8-trioxo-5,7-diazaspiro[2.5]octane-1,1-dicarbonitriles
作者:Michail N. Elinson、Anatolii N. Vereshchagin、Nikita O. Stepanov、Tatiana A. Zaimovskaya、Valentina M. Merkulova、Gennady I. Nikishin
DOI:10.1016/j.tetlet.2009.11.065
日期:2010.1
The direct formation of substituted 2-aryl-4,6,8-trioxo-5,7-diazaspiro[2.5]octane-1,1-dicarbonitriles in 75-95% yields from benzylidenemalononitriles and N,N'-dialkylbarbituric acids is described. (C) 2009 Elsevier Ltd. All rights reserved.