78710-55-1Relevant articles and documents
Selective Synthesis of Symmetrical Secondary Amines from Nitriles with a Pt?CuFe/Fe3O4 Catalyst and Ammonia Borane as Hydrogen Donor
Ai, Yongjian,Guo, Rongxiu,He, GuangQi,Hu, Ze-nan,Liang, Qionglin,Liu, Lei,Niu, Dun,Sun, Hong-bin,Tian, Haimeng,Zhang, Xinyue
, p. 1783 - 1788 (2020/09/02)
Hydrogenation of nitriles is an efficient and environmentally friendly route to synthesize symmetrical secondary amines, but it usually produces a mixture of amines, imines, and hydrogenolysis by-products. Herein we report a magnetic quaternary-component Pt?CuFe/Fe3O4 nanocatalyst system for the selective synthesis of symmetrical secondary amines with ammonia borane as hydrogen donor. The catalyst with a low Pt loading (0.456 wt%) is the source of the activity, and the d-band electron transfer from Cu to Fe enhances the selectivity. This synergistic effect results in the transformation of benzonitrile to dibenzylamine with excellent conversion (up to 99 %) and nearly quantitative selectivity (up to 96 %) under mild reaction conditions, nevertheless, the reaction TOF is as high as up to 1409.9 h?1. A variety of nitriles are suitable for the synthesis of symmetrical secondary amines. More importantly, unwanted hydrogenolysis byproducts, especially toluene, is not detected at all. In addition, the catalyst is magnetically recoverable, and it can be reused up to five times.
Fentanyl analogue and application thereof
-
Paragraph 0048; 0049, (2018/10/04)
The invention discloses a fentanyl analogue and application thereof. A general structural formula of a compound is as follows (described in the following description), wherein R1 is a hydrogen group,a methyl group, a hydroxyl group, a methoxyl group, a halogen and a cyano group, and R2 is a phenyl group, a benzyl group and 3,5-benzyldimethyl. The compound provided by the invention embodies the activating effect of a mu-opioid receptor and the recruitment function of weak beta-arrestin 2, and therefore, the compound can be used as an analgesic drug and can overcome the respiration inhibition effect caused by activating a beta-arrestin 2 signal pathway.
Sequential O- and N-acylation protocol for high-yield preparation and modification of rotaxanes: Synthesis, functionalization, structure, and intercomponent interaction of rotaxanes
Tachibana, Yuya,Kawasaki, Hiroaki,Kihara, Nobuhiro,Takata, Toshikazu
, p. 5093 - 5104 (2007/10/03)
A pseudorotaxane consisting of a 24-membered crown ether and secondary ammonium salt with the hydroxy group at the terminus was quantitatively acylated by bulky acid anhydride in the presence of tributylphosphane as catalyst to afford the corresponding rotaxane in high yield. Large-scale synthesis without chromatographic separation was easily achieved. The ammonium group in the resulting rotaxane was quantitatively acylated with excess electrophile in the presence of excess trialkylamine. Various N-functionalized rotaxanes were prepared by this sequential double-acylation protocol. 1H NMR spectra and X-ray crystallographic analyses of the rotaxanes showed that the crown ether component was captured on the ammonium group in ammonium-type rotaxane by strong hydrogen-bonding intercomponent interaction. The conformation around the ammonium group was fixed by the hydrogen-bonding interaction. Meanwhile, the conformation of the amide-type rotaxane was determined by the weak CH/π interaction between the methylene group in crown ether and the benzene ring of the axle component. The N-acylation of ammonium-type rotaxane is useful for the preparation of both functionalized rotaxanes and weak intercomponent interaction-based rotaxanes.
