Synthesis and activity of endomorphin-2 and morphiceptin analogues with proline surrogates in position 2
摘要:
The opioid agonists endomorphins (Tyr-Pro-Trp-Phe-NH(2); EM1 and Tyr-Pro-Phe-Phe-NH(2); EM2) and morphiceptin (Tyr-Pro-Phe-Pro-NH(2)) exhibit an extremely high selectivity for mu-opioid receptor. Here a series of novel EM2 and morphiceptin analogues containing in place of the proline at position 2 the S and R residues of beta-homologues of proline (HPro), of 2-pyrrolidinemethanesulphonic acid (HPrs) and of 3-pyrrolidinesulphonic acid (beta Prs) have been synthesized and their binding affinity and functional activity have been investigated. The highest p-receptor affinity is shown by [(S)beta Prs(2)]EM2 analogue (6e) which represents the first example of a beta-sulphonamido analogue in the field of mold peptides. (C) 2010 Elsevier Masson SAS. All rights reserved.
Efficient Synthesis of Taurine and Structurally Diverse Substituted Taurines from Aziridines
作者:Libo Hu、Hui Zhu、Da-Ming Du、Jiaxi Xu
DOI:10.1021/jo070470c
日期:2007.6.1
Taurine and substituted taurines were synthesized efficiently from aziridines via ring-opening reaction with thioacetic acid, oxidation with performic acid, and hydrolysis in hydrochloric acid. The current method shows more benefit in purification and efficiency in the preparation of taurine and structurally diverse 2-substituted, 2,2-disubstituted, and 1,2-, 2,2-, and 2,N-alkylene taurines.
A Versatile Synthesis of Various Substituted Taurines from Vicinal Amino Alcohols and Aziridines
作者:Ning Chen、Weiyi Jia、Jiaxi Xu
DOI:10.1002/ejoc.200900759
日期:2009.11
Taurine and structurally diverse substituted taurines have been synthesized by peroxyformic acid oxidation of the thiazolidine-2-thione intermediates generated from vicinal amino alcohols or aziridines and carbon disulfide. Thestereochemistry and mechanisms of the reactions are disscussed. The method is a salt-free and versatile route, convenient in terms of purification, and can be used to synthesize
Expeditious and Practical Synthesis of Various Substituted Taurines from Amino Alcohols
作者:Jiaxi Xu、Wei Zhang、Boyuan Wang、Ning Chen、Da-Ming Du
DOI:10.1055/s-2007-1000861
日期:2008.1
Various substituted taurines have been synthesized expeditiously and practically in satisfactory to good yields directly from amino alcohols using a two-step, one-pot procedure, in which the amino alcohols undergo sulfuric acid esterification and subsequent sodium sulfite substitution. Treatment of amino-substituted secondary alcohols using the same procedure gave 2-substituted or 1,2-di-substituted
Bicyclische β-Sultame: Darstellung aus monocyclischen β-Aminothiolen und einige Eigenschaften
作者:Peter Schwenkkraus、Hans-Hartwig Otto
DOI:10.1002/ardp.19903230208
日期:——
2‐Cyclaminmethanole 3 werden in 2‐Cyclaminmethanthiole 7 umgewandelt, aus denen durch oxidative Chlorierung cyclisch substituierte Taurinsäure‐chloride 8 zugänglich sind. Durch Behandlung mit Basen werden 8 in die bicyclischen β‐Sultame 9 überführt. Spektroskopische Eigenschaftenund Solvolyseverhalten von 9 werden diskutiert.