79359-12-9Relevant articles and documents
Ultrasound-promoted synthesis of-Amino carbonyl compounds via a mannich reaction catalyzed by ionic liquids
Qian, Hua,Kai, Wang,Zhen, Juejie
, p. 143 - 147 (2016/03/01)
Background: Mannich reaction is one of the most important carbon-carbon bond formation reactions in organic synthesis. Traditional methods require a large amount of ungreen catalysts or much longer reaction time, which limits the scope of their application. So, a recyclable catalyst with high activity and selectivity is highly appreciated, and the highly shortened reaction time is also very appealing. Methods: An efficient and facile process to prepare a series of -Amino carbonyl compounds was found via Mannich reactions catalyzed by caprolactam-based Br?nsted acidic ionic liquids under ultrasonic irradiation. Results: [Capl][BF4] was the most effective catalyst in the Mannich reaction, and good yields was gained within 2-6 h. The activity and stability of the catalyst was maintained very well even after five times, and ultrasound can effectively shorten the reaction time and enhance the yield at ambient condition. Conclusion: A convenient procedure for Mannich reaction using acidic ILs catalyst under ultrasonic irradiation has been designed with many superiorities, such as simple manipulation, less reaction time and high yields. The Mannich reaction takes place in no presence of organic solvents such as toluene or ethanol, etc. The new synthetic method reported in this paper would make appreciable contribution to the subject of environmental friendly chemistry and it is available for industrial applications.
Bronsted acidic room temperature ionic liquids each having a N-protonated lactam cation and method for preparing the same
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Page/Page column 4, (2008/06/13)
The invention relates to a class of novel Br?nsted acidic ionic liquids each having a lactam cation, and to a method for preparing the same through simple neutralization reaction of a lactam, which is available in large scale from industry, with a Br?nsted inorganic or organic acid under room temperature. The properties of the lactam Br?nsted acidic ionic liquids are as follows: they are water- and moisture-stable; they are more environmentally benign and lower cost than that of dialkylimidazolium salts; they have stronger Br?nsted acidity and can be used as acidic catalysts and media instead of inorganic corrosive acids, such as concentrated sulfuric acid and hydrofluoric acid, in many acid-catalyzed reactions; and they can also be used as green media for extraction and separation.