5428-09-1Relevant articles and documents
Synthesis and pharmacological characterization of new silicon-based W84-type allosteric modulators for ligand binding to muscarinic M2 receptors
Duda-Johner, Seraina,Dai?, Jürgen O.,Mohr, Klaus,Tacke, Reinhold
, p. 75 - 83 (2003)
The silicon-based allosteric modulators of ligand binding to muscarinic acetylcholine receptors [R1- (CH2) 3-SiMe2-(CH2)5 -NMe2-(CH2)3- R1]Br (3), [R2-(CH2)3 -SiMe2-(CH2)5- NMe2-(CH2)3-R2] Br (4), [R1-(CH2)3- SiMe2-(CH2)5- NMe2-(CH2)3-R2] Br (5), and [R2-(CH2)3- SiMe2-(CH2)5- NMe2-(CH2)3-R1] Br (6) (R1=phthalimido; R2=1,8-naphthalimido) were synthesized, starting from chlorodimethylsilane. Compounds 3-6 were studied for their allosteric interaction at porcine heart muscarinic M2 receptors. They inhibited the dissociation of the orthosteric ligand [3H] N-methylscopolamine ([3H] NMS) with similar potency; compounds 4 and 6 yielded steep concentration-effect curves. All compounds enhanced [3H]NMS equilibrium binding, but with different efficacies. The effect of 4 on [3H]NMS binding was studied at cloned M1-M 5 receptor subtypes. Compound 4 did not affect [3H] NMS equilibrium binding at M1, M3, M4, and M5 receptors, thus representing an M2-selective allosteric enhancer of [3H]NMS binding.
Selective Semi-Hydrogenation of Terminal Alkynes Promoted by Bimetallic Cu-Pd Nanoparticles
Buxaderas, Eduardo,Volpe, María Alicia,Radivoy, Gabriel
, p. 1466 - 1472 (2019/03/07)
The selective semi-hydrogenation of terminal alkynes was efficiently performed, under mild reaction conditions (H 2 balloon, 110 °C), promoted by a bimetallic nanocatalyst composed of copper and palladium nanoparticles (5:1 weight ratio) supported on mesostructured silica (MCM-48). The Cu-PdNPS@MCM-48 catalyst, which demonstrated to be highly chemoselective towards the alkyne functionality, is readily prepared from commercial materials and can be recovered and reused after thermal treatment followed by reduction under H 2 atmosphere.
Preparation method of modified silane coupling agent
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Paragraph 0023; 0024, (2016/10/31)
A preparation method of a modified silane coupling agent comprises: (1), dissolving mono-anhydride or tetracid dianhydride in glacial acetic acid, adding allylamine according to a molar ratio of the mono-anhydride or tetracid dianhydride to the allylamine being 1:1 or 1:2, stirring and reflowing for 3-24 h, adding water, filtering, washing, and drying to obtain an imide product; (2), dissolving the imide product in an aprotic solvent of medium polarity, adding 0.2 ml or 0.35 ml of a catalyst and trialkoxysilane according to a molar ratio to the imide product being 1:1 or 2:1, and reacting at 50-70 DEG C for 5-48 h, distilling at reduced pressure to remove a low-boiling-point fraction to obtain a product.Least catalyst is used at the premise of ensuring optimal catalytic efficiency so that lowest production cost is achieved.