5602-94-8Relevant articles and documents
Preparation method and application of (3R, 4S)-4-ethylpyrrolidine-3-carboxylic acid compound
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Paragraph 0047-0050, (2020/05/14)
The embodiment of the invention discloses a preparation method and application of a (3R, 4S)-4-ethylpyrrolidine-3-carboxylic acid compound, and relates to the technical field of drug synthesis. The (3R, 4S)-4-ethylpyrrolidine-3-carboxylic acid is synthesized by taking glycine ethyl ester as a raw material and sequentially carrying out amino protecting group addition, ring closing, substitution, coupling, catalytic hydrogenation, hydrolysis and protecting group removal. The target product synthesized by the reaction has high yield and chiral purity, and also has the advantages of simple and accessible raw materials, simple synthesis route, mild reaction conditions, simple separation and purification operation and low synthesis cost.
New facile alkoxycarbonylating agent, alkyl pyrazole-1-carboxylates. The preparation and the utilities
Kashima, Choji,Tsuruoka, Shiro,Mizuhara, Saori
, p. 14679 - 14688 (2007/10/03)
Alkyl pyrazole-1-carboxylates (2), which were readily prepared from alkyl chloroformate or carbazate in good yields, were provided as the new facile alkoxycarbonylating agents toward the Grignard reagents for the synthesis of one carbon higher carboxylic esters. Also amines were alkoxycarbonylated by 2 to produce the corresponding urethanes even in an aqueous medium. Benzyl 3,5-dimethylpyrazole-1-carboxylate (2d) could be utilized for the Cbz-protection of amino acids and esters in good yield without any racemization.
Total synthesis of (±)-7-Epi-20-desethylgelsedine
Kende,Luzzio,Mendoza
, p. 918 - 924 (2007/10/02)
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