103-00-4Relevant articles and documents
One-Pot Synthesis of Disubstituted Urea from Carbon Dioxide, Propylene Oxide, and Amines Catalyzed by Imidazolium-Tetraiodoindate
Son, Guang Meang,Truong, Cong Chien,Mishra, Dinesh Kumar,Mishra, Vivek,Kim, Yong Jin
, p. 174 - 183 (2018)
In this article, synthesis of 1,3-disubstituted urea (DSU) from three component reagent systems comprising amine, carbon dioxide, and propylene oxide is described. DSU is synthesized in the presence of a variety of ionic liquids (ILs) with/without promoters. Among used ILs, 1-butyl-3-methylimidazolium tetraiodoindateIII (represented as [Bmim][InI4]) is found to give the highest DSU product. A serious experiment clearly indicates that the tetraiodoindate anion plays an important role for the selective production of the DSU. Based on the in situ infrared spectroscopic studies, a plausible reaction mechanism for producing dicyclohexylurea from cyclohexylamine is proposed. The synthesis and characterization of [Bmim][InI4] are given in details. Moreover, the effect of reaction variables such as time, temperature, pressure, and the molar ratio of substrate to catalyst is also studied.
Process for Preparing Disubstituted Urea and Carbamate Compounds from Amines, Carbon Dioxide, and Epoxides
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Paragraph 0061; 0062; 0063, (2015/05/26)
The present disclosure relates to a method for preparing a disubstituted urea and carbamate compounds simultaneously through a one-pot reaction of an amine, carbon dioxide and an alkylene oxide compound in the presence of an ionic liquid-based complex catalyst system containing indium. In accordance with the present disclosure, a disubstituted urea and carbamate compounds can be prepared simultaneously at high yield. In addition, the ionic liquid-based catalyst containing indium according to the present disclosure is economical because it can be reused several times.
Syntheses of five- and seven-membered ring sultam derivatives by Michael addition and Baylis-Hillman reactions
Tong, Kun,Tu, Jinchang,Qi, Xueyong,Wang, Min,Wang, Yanjie,Fu, Haizhen,Pittman Jr., Charles U.,Zhou, Aihua
supporting information, p. 2369 - 2375 (2013/03/29)
Five- and seven-membered sultam derivatives were conveniently synthesized via intra- or intermolecular Michael additions and an improved vinyl sulfonamide Baylis-Hillman reaction. Two different cyclization pathways were explored for the oxa-Michael reaction. A good solvent was discovered for an otherwise sluggish ketone-type Baylis-Hillman reaction in which vinyl sulfonamide ketones were used as the precursors. Furthermore, a strong base caused vinyl sulfonamide ketones to undergo 5-endo-trig intramolecular cyclizations, which are disfavored according to Baldwin's rule. Finally Baylis-Hillman reaction products were used as scaffolds for diversity-oriented sultam syntheses.