174543-74-9Relevant articles and documents
Preparation method of carboxylic ester compound
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Paragraph 0062-0063, (2021/03/30)
The invention relates to a preparation method of a carboxylic ester compound, which comprises the following steps: reacting carboxylic acid with methanol in air under the catalysis of nitrite to obtain an ester compound, the preparation method disclosed by the invention has the advantages of rich raw material sources, cheap and easily available catalyst, mild reaction conditions, simplicity and convenience in operation and the like, a series of fatty carboxylic acids can be modified with high yield, and particularly, the traditional esterification method is generally not suitable for esterification of drug molecules. By utilizing the method, a series of known drug molecules can be modified, so that a shortcut is provided for discovering new drug molecules.
On the Ritter reaction of cyclic hydroxyamines: Synthesis of conformationally-restricted reduced amide dipeptide isosteres
Taylor, G. Mark,Baker, Stewart J.,Gedney, Andrea,Pearson, David J.,Sibley, Graham E. M.
, p. 1297 - 1300 (2007/10/03)
The Ritter reactions of 3-alkyl-3-hydroxyazetidine or -piperidine derivatives give low yields of the desired products, whereas the 3-alkyl-3-hydroxy-pyrrolidine and 4-alkyl-4-hydroxy-piperidine derivatives react smoothly to give the corresponding acetamides. An alternative route to 3-acylamino-3-alkylpiperidines, which were designed as conformationally-restricted reduced amide dipeptide isosteres, was devised from nipecotic acid vai a Hofmann rearrangement.
