107746-25-8Relevant academic research and scientific papers
Chiral hybrid materials based on pyrrolidine building units to perform asymmetric Michael additions with high stereocontrol
Llopis, Sebastián,García, Teresa,Cantín, ángel,Velty, Alexandra,Díaz, Urbano,Corma, Avelino
, p. 5835 - 5847 (2018/11/24)
A new chiral mesoporous hybrid material was synthesized based on pyrrolidine units included in a siliceous framework, HybPyr, and integrated into the organic-inorganic structure, from a specific bis-silylated precursor. A fluoride sol-gel methodology under soft synthesis conditions and in the absence of sophisticated structural directing agents allowed the generation of a mesoporous architecture with a homogeneous distribution of active chiral moieties along the network. The hybrid material was studied by means of different characterization techniques (TGA, NMR and IR spectroscopy, chemical and elemental analyses, TEM, and textural measurements), verifying the stability and integrity of the asymmetric active sites in the solid. The hybrid material, HybPyr, is an excellent asymmetric heterogeneous and recyclable catalyst for enantioselective Michael addition of linear aldehydes to β-nitrostyrene derivatives with high stereocontrol of the reaction products.
Preparation method for L-hydroxyproline
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Paragraph 0077, (2016/10/10)
The invention provides a preparation method for L-hydroxyproline. The preparation method comprises the following steps: preparing pyroglutamic acid; preparing pyroglutamate; preparing pyroglutamic acid alcohol; preparing (3R,7aS)-3-phenyltetrahydropyrrolo[1,2]oxazole-5(3H)-one; and preparing L-hydroxyproline. Compared with the prior art, the invention has the following beneficial effects: the method overcomes the problems that a traditional manner of extraction of L-hydroxyproline from an animal donor has potential safety hazards and that production of L-hydroxyproline is limited as biological raw materials are utilized, and can synthesize L-hydroxyproline under the condition of shortage of biological raw materials; synthetic methods for L-hydroxyproline are enriched; the added value of L-hydroxyproline is increased; the application scope of L-hydroxyproline can be further broadened; prepared L-hydroxyproline is high in yield and purity, so the synthesis purity of atazanavir is indirectly improved; and common raw materials can be selected in preparation of L-hydroxyproline, so production cost is low.
The synthesis of piperidine nucleoside analogs - A comparison of several methods to access the introduction of nucleobases
Kova?ková, Soňa,Dra?ínsky, Martin,Rejman, Dominik
, p. 1485 - 1500 (2011/04/15)
This work deals with the synthesis of piperidine and hydroxypiperidine analogs of nucleosides. Starting from commercially available 3-hydroxypiperidine, proline or 4-hydroxyproline, a series of piperidine derivatives of both purine and pyrimidine nucleobases was prepared. Various methods of nucleobase attachment were evaluated. The prepared compounds were tested for cytostatic, antibacterial, and antiviral properties but no significant activity was found.
Enantiospecific synthesis and receptor binding of novel dopamine receptor ligands employing natural 4-hydroxyproline as a practical and flexible building block
Heindl, Cornelia,Huebner, Harald,Gmeiner, Peter
, p. 3153 - 3172 (2007/10/03)
Starting from natural 4-hydroxyproline, an ex-chiral pool approach is described giving access to 2-aminoalkylpyrrolidine derivatives that were used as chiral building blocks for the synthesis of bioactive 2-methoxybenzamide derivatives. The 4-hydroxy substituent can be displaced employing organocuprates as useful carbanion equivalents. Dopamine and serotonin binding studies involving the subtypes D1, D2long, D2short, D3 and D4 as well as 5-HT1A and 5-HT2, respectively, provided interesting insights into stereoselective structure activity relationships. The (2S,4R)-2-aminomethylpyrrolidine derivative ent-66 and the (2R,4S)-2- aminoethylpyrrolidine derivative 68 showed remarkable affinity and preference for the dopamine D3 and D4 receptor subtypes, respectively, both being putatively associated to the symptoms of schizophrenia.
Ex-chiral pool synthesis and receptor binding studies of 4-substituted prolinol derivatives
Heindl, Cornelia,Huebner, Harald,Gmeiner, Peter
, p. 3141 - 3152 (2007/10/03)
Starting from natural 4-hydroxyproline, preparation of the four possible stereoisomers of 4-amino- and 4-aminomethyl-substituted prolinol derivatives, respectively, was accomplished by chemo- and regioselective functional group transformations at the 2- and 4-positions of the pyrrolidine moiety. These building blocks were used as valuable precursors for the preparation of new methoxybenzamide derivatives. Dopamine and serotonin binding studies involving the subtypes D1, D2long, D2short, D3 and D4 as well as 5-HT1A and 5-HT2, respectively, displayed interesting structure activity relationships, especially with respect to the absolute and relative configuration of the test compounds. As a complement to the D3 receptor preferring aminomethylpyrrolidine FAUC 21, the (2R,4R)-aminoprolinol derivative ent-24 (FAUC 65) preferentially recognizing the D4 subtype was developed.
Asymmetric syntheses of all four isomers of 4-amino-4-carboxyproline: Novel conformationally restricted glutamic acid analogues
Tanaka,Sawanishi
, p. 1641 - 1656 (2007/10/02)
Asymmetric syntheses of all four isomers of 4-amino-4-carboxyprolines, i.e. (2S,4S)-3, (2S,4R)-4, and their corresponding enantiomers, as novel conformationally restricted analogues of glutamic acid, were performed from trans-4-hydroxy-L-proline as a homochiral starting material. The key step was the spirohydantoin ring formation by employing the Bucherer-Bergs reaction of 4-oxoproline derivatives. These structures were determined by NMR studies.
Benzazepine and benzothiazepine derivatives
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, (2008/06/13)
Vasodilating activity is exhibited by compounds having the formula STR1 wherein X can be --S--or --CH2 --; and R2 is STR2 depending upon the definition of X.
