作者:Raffael C. Wende、Alexander Seitz、Dominik Niedek、Sören M. M. Schuler、Christine Hofmann、Jonathan Becker、Peter R. Schreiner
DOI:10.1002/anie.201509863
日期:2016.2.18
report the development of the first enantioselective Dakin–West reaction, yielding α‐acetamido methylketones with up to 58 % ee with good yields. Two of the obtained products were recrystallized once to achieve up to 84 % ee. The employed methylimidazole‐containing oligopeptides catalyze both the acetylation of the azlactone intermediate and the terminal enantioselective decarboxylative protonation. We
Large-scale synthesis of anticoagulant decapeptide MDL 28050
作者:William J. Hoekstra、Shyam S. Sunder、Robert J. Cregge、Louis A. Ashton、Kenneth T. Stewart、Chi-Hsin R. King
DOI:10.1016/s0040-4020(01)88142-4
日期:——
A solution phase synthesis of the anticoagulant decapeptide Suc-Tyr-Glu-Pro-Ile-Pro-Glu-Glu-Ala-Cha-D-Glu-OH (, MDL 28050) on a large scale is described. Our strategy employed in the 24-step totalsynthesis relies on a convergent approach. The basic feature is the preparation and the coupling of two protected pentapeptides, 2 and 3. Several key intermediates were purified by crystallizations including
描述了大规模的抗凝血十肽Suc-Tyr-Glu-Pro-Ile-Pro-Glu-Glu-Ala-Cha- D -Glu-OH的溶液相合成。我们在24步全合成中采用的策略依赖于收敛方法。基本特征是两个受保护的五肽2和3的制备和偶联。通过结晶纯化了几种关键中间体,包括保护的十肽21。仅需一次纯化即可进行制备型HPLC。使用这种合成路线,我们以40克的规模制备了98%的纯净最终产品1。该过程的总产率为约20%。
New renin-inhibitory oligopeptides, their preparaton and their use
申请人:Sankyo Company Limited
公开号:EP0274259A2
公开(公告)日:1988-07-13
New renin-inhibitory oligopeptides, their preparaton and their use. Oligopeptides of formula (I):
where R1 -R5 are various organic groups, and A represents a group of formula -NH-or -(CH2)n-, in which n represents an integer of from 1 to 3, have renin-inhibitory activity and are particularly suitable for oral administration. They may be prepared by condensing their component amino acids or lower oligopeptides using conventional peptide synthesis reactions.
A series of cyclic pseudopeptides of the formula cyclo(Leu Psi[CH2NH]Xaa-Gln-Trp-Phe-beta Ala), where Xaa represents the residue of an alpha-amino acid, has been synthesized in order to establish the role of the Xaa side chain for tachykinin NK-2 receptor antagonist activity. Syntheses have been carried out in solid phase with either Fmoc or Boc strategy. The antagonist potency on NK-2 receptors in the hamster isolated trachea (HT) and the rabbit isolated pulmonary artery (RPA) bioassays increases with Xaa Lipophilicity; cyclo(Leu Psi[CH2NH]Cha-Gln-Trp-Phe-beta Ala) and cyclo(Leu Psi[CH2NH]Asp(NHBzl)-Gln-Trp-beta Ala) resulted in being the two most active antagonists (pA(2) = 9.06 and 9.26 on HT, respectively). A significant linear correlation was found between pA(2) values determined in HT and RPA bioassays and capacity factors measured in reversed phase HPLC. The comparison between the biological activities of cyclic hexapeptides containing or not containing the aminomethylene moiety proved the crucial role of the pseudopeptide bond for determining high antagonist potency at the NK-2 receptor.