Peptide-Catalyzed Conversion of Racemic Oxazol-5(4H)-ones into Enantiomerically Enriched α-Amino Acid Derivatives
摘要:
We report the development and optimization of a tetrapeptide that catalyzes the methanolytic dynamic kinetic resolution of oxazol-5(4H)-ones (azlactones) with high levels of enantioinduction. Oxazolones possessing benzylic-type substituents were found to perform better than others, providing methyl ester products in 88:12 to 98:2 er. The mechanism of this peptide-catalyzed process was investigated through truncation studies and competition experiments. High-field NOESY analysis was performed to elucidate the solution-phase structure of the peptide, and we present a plausible model for catalysis.
[EN] PYRIDIN- 2 -AMIDES USEFUL AS CB2 AGONISTS<br/>[FR] PYRIDIN-2-AMIDES UTILES COMME AGONISTES DE CB2
申请人:HOFFMANN LA ROCHE
公开号:WO2012168350A1
公开(公告)日:2012-12-13
The invention relates to a compound of formula (I) wherein R1 to R4 are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.
[EN] NITROGEN-CONTAINING HETEROCYCLIC COMPOUND<br/>[FR] COMPOSÉ HÉTÉROCYCLIQUE CONTENANT DE L'AZOTE
申请人:TAKEDA PHARMACEUTICAL
公开号:WO2013018929A1
公开(公告)日:2013-02-07
The present invention provides a novel compound having a superior activity as an ERR-α modulator and useful as an agent for the prophylaxis or treatment of ERR-α associated diseases. The present invention relates to a compound represented by the formula (1) wherein each symbol is as defined in the specification, or a salt thereof.
Structural studies of β-turn-containing peptide catalysts for atroposelective quinazolinone bromination
作者:A. J. Metrano、N. C. Abascal、B. Q. Mercado、E. K. Paulson、S. J. Miller
DOI:10.1039/c6cc01428c
日期:——
X-Ray crystallography and NMR spectroscopy were used to investigate the effect of primary structure on both secondary structure and enantioselectivity in peptide-based catalysts for an atroposelective bromination reaction.
Enantioselective Synthesis of 3-Arylquinazolin-4(3<i>H</i>)-ones via Peptide-Catalyzed Atroposelective Bromination
作者:Matthew E. Diener、Anthony J. Metrano、Shuhei Kusano、Scott J. Miller
DOI:10.1021/jacs.5b07726
日期:2015.9.30
atroposelective bromination of pharmaceutically relevant 3-arylquinazolin-4(3H)-ones (quinazolinones) with high levels of enantioinduction over a broad substrate scope. The structure of the free catalyst and the peptide-substrate complex were explored using X-ray crystallography and 2D-NOESY experiments. Quinazolinone rotational barriers about the chiral anilide axis were also studied using density functional
Diversity of Secondary Structure in Catalytic Peptides with β-Turn-Biased Sequences
作者:Anthony J. Metrano、Nadia C. Abascal、Brandon Q. Mercado、Eric K. Paulson、Anna E. Hurtley、Scott J. Miller
DOI:10.1021/jacs.6b11348
日期:2017.1.11
state conformations for peptides of this family, as well as the dynamic processes associated with conformational equilibria, underscore not only the challenge of designing peptide-based catalysts, but also the difficulty in predicting their accessible transition states. These findings implicate the advantages of low-barrier interconversions between conformations of peptide-based catalysts for multistep
X 射线晶体学已应用于一系列四肽的结构分析,这些四肽之前已评估了其在间质选择性溴化反应中的催化活性。该系列的共同点是中央 Pro-Xaa 序列,其中 Pro 是 l-或 d-脯氨酸,选择它是为了有利于规范 β 转角二级结构的成核。对 35 种不同肽序列的晶体学分析揭示了一系列构象状态。观察到的差异不仅出现在 Pro-Xaa 环区发生改变的情况下,而且还出现在对侧翼残基进行看似微妙的改变时。在许多情况下,观察到相同序列的不同构象异构体,或者作为同一晶胞内的对称独立分子,或者作为多晶型物。使用 DFT 的计算研究为固态结构特征的分析提供了额外的见解。将选定的 X 射线晶体结构与从测量的质子化学位移、3J 值和 1H–1H-NOESY 接触得出的相应溶液结构进行比较。这些发现意味着,简单的基于肽的催化剂可用的构象空间比先例所暗示的更加多样化。对该家族肽的多个基态构象的直接观察,以及与构象平衡相关