23363-88-4Relevant articles and documents
Selective hydrogenation of paracetamol to acetamidocyclohexanone with silylated SiO2 supported Pd-based catalysts
Song, Wenjing,Liu, Xiuna,Jiang, Shaoyang,Chen, Zhou,Weng, Weizheng,Rodríguez-Ramos,Yi, Xiaodong,Fang, Weiping
, p. 41572 - 41579 (2016)
A series of catalysts comprising well-distributed Pd nanoparticles incorporated on silylated SiO2 were fabricated by the wet impregnation method and investigated in the selective hydrogenation of paracetamol to 4-acetamidocyclohexanone. The catalysts calcined at different temperatures were characterized by TG, FT-IR, N2 physisorption, TPR and XPS. The results showed that organic modification led to a catalyst surface composed of stable Si-(CH3)3 species even after calcination at 300 °C. Also, changes occurred in the size and electronic properties of the Pd particles through the different amounts of grafted groups on the SiO2 support. The mode of adsorption of the paracetamol molecule was influenced by the quite bulky organic groups on the support, resulting in a significant improvement in selectivity towards 4-acetamidocyclohexanone and preventing full hydrogenation to some extent. The best result was obtained on the silylated Pd catalyst calcined at 500 °C, with 64.9% selectivity to keto at the paracetamol conversion of 60.5%, while the non-silylated SiO2 supported Pd catalyst gave 4-acetamidocyclohexanone selectivity of 29.1% at 53.8% conversion.
Ligand-Receptor Interactions via Hydrogen-Bond Formation. Synthesis and Pharmacological Evaluation of Pyrrolo and Pyrido Analogues of the Cardiotonic Agent 7-Hydroxycyclindole
Dionne, Gervais,Humber, Leslie G.,Asselin, Andre,McQuillan, Juanita,Treasurywala, Adi M.
, p. 1452 - 1457 (2007/10/02)
The syntheses of N,N-dimethyl-6,7,8,9-tetrahydro-3H,10H-pyrrolocarbazol-7-amine (8), N,N-dimethyl-7,8,9,10-tetrahydro-11H-pyridocarbazol-8-amine (9a), and the N,N,11-trimethyl analogue (9b) are described.The in vitro inotropic activity of these compounds, as well as the known cardiotonics amrinone and 7-hydroxycyclindole (7), was investigated.Compound 8, a pyrrolo analogue of 7, was devoid of inotropic activity, while the pyrido analogues 9 were equiactive to 7 and amrinone.These results suggest that the hydroxyl group of 7 functions as an H-bondacceptor, rather than a donor, and that on interaction of 7, and the pyrido analogues 9, with a common receptor, an orbital occupied by one of the oxygen lone pair electrons of 7 must assume the same orientation as the orbital occupied by the pyridine nitrogen lone pair.
