Synthesis and biological evaluation of new biphalin analogues with non-hydrazine linkers
摘要:
Biphalin is a potent opioid peptide agonist, with a palandromic structure, composed of two enkephalin-like active fragments connected tail to tail by a hydrazine linker (Tyr-D-Ala-Gly-Phe-NH-NH <-Phe <-Gly <-D-Ala <-Tyr). This study presents the synthesis and in vitro bioassays of six new biphalin analogues with three different non-hydrazine linkers, some of which have higher binding affinity and bioactivity than biphalin. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and biological evaluation of new biphalin analogues with non-hydrazine linkers
摘要:
Biphalin is a potent opioid peptide agonist, with a palandromic structure, composed of two enkephalin-like active fragments connected tail to tail by a hydrazine linker (Tyr-D-Ala-Gly-Phe-NH-NH <-Phe <-Gly <-D-Ala <-Tyr). This study presents the synthesis and in vitro bioassays of six new biphalin analogues with three different non-hydrazine linkers, some of which have higher binding affinity and bioactivity than biphalin. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and catalytic properties of diverse chiral polyamines
作者:Mindy Levine、Craig S. Kenesky、Shengping Zheng、Jordan Quinn、Ronald Breslow
DOI:10.1016/j.tetlet.2008.07.108
日期:2008.9
was also explored.Text: Chiral polyamines have been utilized for a variety of applications. First, polyamines are polycationic at neutral pH; as such, they interact strongly with both DNA and RNA.1 They can therefore be utilized as effective nonviral gene delivery agents.2 Second, chiral polyamines are efficient catalysts for various organic transformations.3 Polyamines have also been used to solubilize
手性多胺可用于各种潜在应用,从不对称催化到 DNA 和 RNA 的非病毒基因传递系统。它们还可用于溶解碳纳米管。因此,需要直接合成手性多胺的方法。我们在此提出了两种用于获得手性多胺的合成策略。还探索了这些手性胺催化两种具有高度手性诱导的有机反应的潜力。文本:手性多胺已用于多种应用。首先,多胺在中性 pH 值下是聚阳离子的;因此,它们与 DNA 和 RNA 有很强的相互作用。1 因此它们可以用作有效的非病毒基因传递剂。2 其次,手性多胺是各种有机转化的有效催化剂。3 多胺也已用于溶解碳纳米管。4 最后,手性多胺是许多过渡金属的极好配体。5 由于其应用众多,因此对其制备的高产合成策略有很大的需求。我们在此提出了获得手性多胺的两种合成策略,以及这些手性胺催化两种有机反应的潜力。
Cu<sup>2+</sup>, Zn<sup>2+</sup>, and Ni<sup>2+</sup> Complexes of <i>C</i><sub>2</sub>-Symmetric Pseudopeptides with an Aromatic Central Spacer
作者:Lingaraju Gorla、Vicente Martí-Centelles、Lena Freimuth、Belén Altava、M. Isabel Burguete、Santiago V. Luis
DOI:10.1021/acs.inorgchem.6b01066
日期:2016.8.1
corresponding Cu2+ and Ni2+ have been obtained, revealing the metal atom in an essentially square-planar geometry, although, in several instances, the oxygen atom of an amide carbonyl of a second complex species can act as a fifth coordination site. In the case of Zn2+, the only crystal structure obtained displays a square-pyramidal arrangement of the metal center. Finally, preliminary experiments show the
A highly enantioselective cyanation of imines (up to >99 % ee) has been developed using well-designed C2-symmetric hydrogen bonding catalysts. This catalytic system is distinguished by its lowcatalystloading (S/C up to 1000), high efficiency, extremely broad substrate scope, scalability and mild reaction conditions.
使用精心设计的 C 2对称氢键催化剂开发了亚胺的高度对映选择性氰化(高达 >99 % ee)。该催化体系的特点是催化剂负载量低(S/C高达1000)、效率高、底物范围极广、可扩展性和反应条件温和。
Novel chiral Schiff base ligands from amino acid amides and salicylaldehyde
作者:Massimo Curini、Francesco Epifano、Federica Maltese、Maria C. Marcotullio
DOI:10.1016/s0040-4039(02)00687-1
日期:2002.5
A novel type of symmetric chiral Schiff base ligands has been synthesized in good yield Using an easy and good fielding stepwise approach front alpha-phenylenediamine, amino acids and salicylaldehyde. (C) 2002 Elsevier Science Ltd. All rights reserved.