Tunable Prussian blue analogues for the selective synthesis of propargylamines through A<sup>3</sup> coupling
作者:Carlos Marquez、Francisco G. Cirujano、Cédric Van Goethem、Ivo Vankelecom、Dirk De Vos、Trees De Baerdemaeker
DOI:10.1039/c8cy00073e
日期:——
M1[Co(CN)6]2/3-type Prussian blue analogues (M1–Co PBAs) were studied as catalysts for the synthesis of propargylamines via A3 coupling of phenylacetylene, benzaldehyde and piperidine.
Subtype-selective NMDA receptor ligands and the use thereof
申请人:——
公开号:US20010051633A1
公开(公告)日:2001-12-13
The invention relates to subtype-selective NMDA receptor ligands and the use thereof for treating or preventing neuronal loss associated with stroke, ischemia, CNS trauma, hypoglycemia and surgery, as well as treating neurodegenerative diseases including Alzheimer's disease, amyotrophic lateral sclerosis, Huntington's disease and Down's syndrome, treating or preventing the adverse consequences of the overstimulation of the excitatory amino acids, treating anxiety, psychosis, convulsions, aminoglycoside antibiotics-induced hearing loss, migraine headache, chronic pain, Parkinson's disease, glaucoma, CMV retinitis, urinary incontinence, opioid tolerance or withdrawal, and inducing anesthesia, as well as for enhancing cognition.
The reductive amination of a series of aldehydes with secondary amines and H-2 in the presence of a homogeneous Rh-diphosphane catalyst was studied in order to establish a general mechanism of this reaction and to identify conditions for the improvement of the amine/alcohol ratio in the product. Several possible intermediates as constituents of changing equilibria like half-aminals. N,O-acetals and aminals were observed in the reaction mixture by means of H-1 NMR spectroscopy. In individual trials, these compounds could be successfully hydrogenated under the conditions applied for reductive amination (50 bar H-2 pressure, MeOH). Some evidence is accumulated that half-aminals and N,O-acetals might be key intermediates of the reductive amination. Moreover, it was found that the formation of the undesired product alcohol is likely based on the reduction of the starting carbonyl compound. However, due to numerous equilibria consisting of several intermediates, general conclusions are hard to be drawn. Proof will be given that, in several cases, the efficiency of the reductive amination of aliphatic aldehydes can be significantly improved by prehydrogenation of the cationic [Rh(dppb)(COD)](+) complex.
Dornow; Thies, Justus Liebigs Annalen der Chemie, 1953, vol. 581, p. 219,224