147065-06-3Relevant articles and documents
Melphalan intermediate and preparation method thereof
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Paragraph 0043; 0058; 0063-0064; 0107; 0122; 0127-0128; 0171, (2019/08/02)
The invention discloses a Melphalan intermediate and a preparation method thereof. The Melphalan intermediate is prepared by acidifying a compound p-nitrobenzaldehyde under the action of methanol, a hydrochloric acid solvent, etc. The preparation method has a route with mild reaction conditions, is higher than an existing preparation method in yield, is economical and effective, and is suitable for large-scale industrial production. The synthesis route is as shown in the description.
Asymmetric chemoenzymatic synthesis of N-acetyl-α-amino esters based on lipase-catalyzed kinetic resolutions through interesterification reactions
Da Silva, Marcos Reinaldo,De Mattos, Marcos Carlos,De Oliveira, Maria Da Concei??o Ferreira,De Lemos, Telma Leda Gomes,Ricardo, Nágila Maria Pontes Silva,De Gonzalo, Gonzalo,Lavandera, Iván,Gotor-Fernández, Vicente,Gotor, Vicente
, p. 2264 - 2271 (2014/03/21)
Several phenylalanine analogs have been synthesized through a four-step route starting from easily available ethyl acetamidocyanoacetate. In a first reaction, and making use of phase transfer catalysts, this compound reacted with several alkyl halides, being benzyltributylammonium chloride identified as the best one for the production of a series of quaternary amino acids in moderate to excellent yields (52-95%). Then, the corresponding N-acetyl-phenylalanine methyl and allyl ester derivatives were obtained through acidic hydrolysis, esterification, and N-acetylation. Rhizomucor miehei lipase was found as a versatile enzyme for the resolution of these amino esters, finding the best results through interesterification reactions with butyl butyrate in acetonitrile. A great influence in the stereoselectivity was found depending on the chemical structure of the compound, achieving for the non- or para-substituted in the phenyl ring excellent stereoselectivities, being moderate for the meta-nitro derivative, while the ortho-nitro amino ester did not react.
Anthranilic acid based CCK1 receptor antagonists: Preliminary investigation on their second "touch point"
Varnavas, Antonio,Lassiani, Lucia,Valenta, Valentina,Mennuni, Laura,Makovec, Francesco,Hadjipavlou-Litina, Dimitra
, p. 563 - 581 (2007/10/03)
In this phase of structure-affinity relationship study of VL-0395, a new anthranilic acid based CCK1 selective antagonist, we propose a series of unnatural aminoacidic derivatives. The result of this work is the identification of a new CCK ligand, which possesses an affinity (IC50 = 35 nm) one order of magnitude greater than the lead and, as a general rule, it points out how the hypothesized receptorial pocket which accommodates the Phe residue allows much more structural modification than that interacting with the N-terminal group. Hence, the modification of the C-terminal pharmacophoric group of our lead VL-0395 can not only enhance the affinity of anthranilic acid derivatives but can modulate the selectivity for one CCK receptor subtype or afford mixed antagonists.
UNUSUAL AMINO ACIDS. III. ASYMMETRIC SYNTHESIS OF 3-ARYLALANINES
Taudien, Stefan,Schinkowski, Klaus,Krause, Hans-Walter
, p. 73 - 84 (2007/10/02)
21 (Z)-α-N-benzoylamino-β-arylacrylic acids and their esters were prepared by known procedures and hydrogenated to the corresponding optically active α-benzoyl-β-arylalanine derivatives with optical yields in the range of 82-95percent ee using the cationi