Preparation method for pyrrolidine-2-carboxylic acid derivatives
申请人:ZHEJIANG JIUZHOU PHARMACEUTICAL CO., LTD.
公开号:US20160145208A1
公开(公告)日:2016-05-26
The present invention relates to the field of medical synthesis, in particular to a preparation method for pyrrolidine-2-carboxylic acid derivatives. The present invention adopts the following technical solution: providing a compound having a structure of formula (E), wherein R is R
1
or R
2
, R
1
is C
1
-C
6
an alkyl, benzyl, p-methoxybenzyl, or p-nitrobenzyl group, and R
2
is hydrogen; R
3
is a protecting group of the carboxyl group; and P
1
is a protecting group on nitrogen.
Synthesis of new aza-bicyclic 2-isoxazolines by 1,3-dipolar cycloaddition of endocyclic enecarbamates and enamides with nitrile oxides
作者:Valderes Moraes de Almeida、Rosiel José dos Santos、Alexandre José da Silva Góes、José Gildo de Lima、Carlos Roque Duarte Correia、Antônio Rodolfo de Faria
DOI:10.1016/j.tetlet.2008.11.096
日期:2009.2
4-b]pyrrolidines, and 4,5-dihydroisoxazole[5,4-b]piperidines were synthesized in a highly regioselective manner through a 1,3-dipolar cycloaddition reaction of 5- and 6-membered endocyclic enecarbamates and enamides with several nitrile oxides in good to excellent yields. Hydrogenolysis of 5- and 6-membered Cbz-cycloadducts led to secondary amines, which presented distinctive stabilities. 2-Isoxazoline
新型的氮杂双环2-异恶唑啉,4,5-二氢异恶唑[5,4- b ]吡咯烷和4,5-二氢异恶唑[5,4- b ]哌啶以高度区域选择性的方式通过1,3-偶极合成5元和6元环内氨基甲酸酯和酰胺与几种腈氧化物的环加成反应,收率良好或优异。5元和6元Cbz-环加合物的氢解反应生成仲胺,具有独特的稳定性。通过N-苯甲酰化,然后仲胺的氨解,或直接从环加合物的氨解,以高收率获得了2-异恶唑啉双酰胺。
Regioselective Synthesis of Symmetrical and Unsymmetrical Bis(heteroaryl)methane (BHM)-Containing Amino Acids
作者:Rafat Ali、Mohd. Zisan Ahamad、Shalini Singh、Wahajul Haq
DOI:10.1002/ejoc.201900043
日期:2019.2.28
The regioselectivesynthesis of bis(heteroaryl)methane (BHM)‐containing amino acids has been developed. The BHM is considered as a versatile scaffold in a number of biological applications. It has been demonstrated that this approach is also applicable to the synthesis of unsymmetrical bis‐indolylmethanes (BIMs) prototype equally well. These interesting and highly useful amino acids are obtained in
Design and synthesis of plant cyclopeptide Astin C analogues and investigation of their immunosuppressive activity
作者:Fei Li、Xi-Xi Guo、Guang-Zhi Zeng、Wei-Wei Qin、Bo Zhang、Ning-Hua Tan
DOI:10.1016/j.bmcl.2018.05.050
日期:2018.8
Astin C analoguescontainingD-aminoacid residues, hydrophobic long-chain alkyl substituents, and aryl substituents performed better than those carrying hydrophilic amino acid residues and short-chain alkyl substituents. Moreover compounds 15, 16, and 17 had no immunosuppressive activity, which suggested that cis-3,4-dichlorinated proline played an important role in the immunosuppressive activity of Astin