27514-08-5Relevant articles and documents
Heteroaromatic analogs of benzomorphan. III. Synthesis of 1,2,3,4,5,6 hexahydro 2,6 methano 3 methylpyrido[3,2 d]azocine
Adachi,Nomura,Yamamoto,Mitsuhashi
, p. 2876 - 2880 (1976)
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Overcoming Problems at Elaboration and Scale-up of Liquid-Phase Pd/C Mediated Catalytic Hydrogenations in Pharmaceutical Production
Tungler, Antal,Szabados, Erika
, p. 1246 - 1251 (2016/07/23)
The practical solutions for scale-up and production of intermediates or precursors of pharmaceuticals by liquid-phase Pd/C mediated hydrogenation can be of considerable interest and deserve broader attention even if they have not been the focus of previously published research due to regulations of patent law. The practical obstacles are persistent and have been known for a long time, but for the most part remained unpublished. The most important discoveries and solutions that contributed to the successful scale-up of hydrogenations for pharmaceutical production were the following: (i) the poisoning of Pd/C catalyst with Fe2+ ions for the selective hydrogenation of 2,6-dimethyl-1-nitrosopiperidine to the corresponding hydrazo compound; (ii) alloying of the deposited Pd metal with Cu for converting the aromatic acid chlorides into the corresponding aldehydes; (iii) alteration of the pH of the reaction mixture to basic values which enhanced the stereoselectivity of paracetamol hydrogenation; (iv) a useful modification of the catalyst preparation process, i.e., the acidification of the catalyst resulted in the hydrogenolysis of benzylic OH in a molecule containing a basic N atom; (v) use of two liquid phases, altogether a four-phase system, which permitted the hydrogenolysis of the S-S bond in a potential catalyst poisoning molecule; (vi) the preservation of the metallic Pd surface of the catalyst by saturation of the reaction mixture with hydrogen, resulting in a high H2/substrate ratio, increased the aldehyde yield in the hydrogenation of 4-chloro-butyric-acid-chloride by avoiding the unwanted poisoning effect of the hydrochloric acid. In the present article, these problems and their solutions, as they emerged during the scale-up of the processes, will be discussed in detail.
AMINOPIPERIDINE DERIVATIVES, PREPARATION THEREOF AND THERAPEUTIC USE THEREOF
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Page/Page column 25, (2010/11/28)
The present invention relates to compounds of formula (I) as defined herein that are melanocortin receptor agonists, to the preparation thereof and to the therapeutic use thereof in the treatment and in the prevention of obesity, diabetes and sexual dysfunctions that can affect both sexes, in the treatment of cardiovascular diseases, and also in anti-inflammatory uses or in the treatment of alcohol dependency.