A Novel Chiral Pentamine Ligand for Enantioselective α-Alkylation of Acyclic Lithium Amide Enolates. Optimization of Chiral Ligands for Asymmetric Reactions Using Solid-Phase Organic Synthesis
摘要:
[GRAPHICS]A novel pentamine ligand has been developed for enantioselective alpha-alkylation of simple acyclic lithium amide enolates. It has been demonstrated that solid phase organic synthesis provides a powerful and rapid method for finding efficient chiral ligands.
Structure–activity relationships of the peptide deformylase inhibitor BB-3497: modification of the P2′ and P3′ side chains
摘要:
Structural modifications to the peptide deformylase inhibitor BB-3497 are described. In this paper, we describe the initial SAR around this lead for modifications to both the P2' and P3' side chains. Enzyme inhibition and antibacterial activity data revealed that a variety of substituents are tolerated at the P2' and P3' positions of the inhibitor backbone. The data from this study highlights the potential for modification at the P2' and P3' positions to optimise the physicochemical properties. (C) 2003 Elsevier Ltd. All rights reserved.
Compounds and methods for inhibiting the interaction of BCL proteins with binding partners
申请人:Castro C. Alfredo
公开号:US20060025460A1
公开(公告)日:2006-02-02
One aspect of the present invention relates to heterocyclic compounds that bind to bcl proteins and inhibit Bcl function. Another aspect of the present invention relates to compositions comprising a heterocyclic compound of the invention. The present invention provides methods for treating and modulating disorders associated with hyperproliferation, such as cancer.
The invention relates to a compound of formula (I)
wherein R
1
to R
4
are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.
Dialkyl amides of L-valine, L-isoleucine, and L-tert-leucine (2) are excellent chiral auxiliaries for the construction of quaternary stereocenters at ambient temperature. Enaminoesters 3, prepared from these auxiliaries 2 and Michael donors 1, undergo a copper-catalyzed asymmetricMichaelreaction with methyl vinyl ketone (MVK, 4) to afford products 5 in 70-90% yield and 90-99% ee (enantiomeric excess)
Ring-Opening Polymerization of Lactides Catalyzed by Natural Amino-Acid Based Zinc Catalysts
作者:Donald J. Darensbourg、Osit Karroonnirun
DOI:10.1021/ic902271x
日期:2010.3.1
to be dimeric with bridging phenoxide ligands. All zinccomplexes were shown to be very effective catalysts for the ring-opening polymerization (ROP) of lactides at ambient temperature, producing polymers with controlled and narrow molecular weight distributions. These enantiomerically pure zinccomplexes did not show selectivity toward either l- or d-lactide, that is, kd(obsd)/kl(obsd) ≈ 1. However
使一系列源自天然氨基酸的手性NNO-三齿Schiff碱配体与锌(双-三甲基甲硅烷基酰胺)2反应,以提供已充分表征的金属配合物。这些衍生物之一进一步与对氟苯酚反应,生成酚盐配合物。X射线晶体学研究表明锌席夫碱酰胺络合物是单体,而对位氟酚盐配合物显示为具有桥接酚盐配体的二聚体。已显示所有锌络合物都是在环境温度下丙交酯开环聚合(ROP)的非常有效的催化剂,可生产分子量分布受控且较窄的聚合物。这些对映体纯的锌络合物对l-或d-丙交酯均没有选择性,即k d( obsd )/ k l(obsd) ≈1。但是,席夫碱配体上的空间取代基显示出对中度至极好的立体控制。外消旋-丙交酯的ROP 。异规聚丙交酯由具有P r的rac-丙交酯生成取决于所使用的催化剂和反应温度,该值在0.68至0.89的范围内。席夫碱配体上的取代基极大地影响了各种催化剂的反应性,而体积较大的取代基的速率得到了提高。
Novel bifunctional thiourea–ammonium salt catalysts derived from amino acids: application to highly enantio- and diastereoselective aza-Henry reaction
作者:Hong-Yu Wang、Zhuo Chai、Gang Zhao
DOI:10.1016/j.tet.2013.04.079
日期:2013.6
development of new efficient and easily accessible catalysts has been one of the focuses in asymmetric phase-transfer catalysis. In this paper, a novel class of chiral bifunctional thiourea–ammonium phase-transfercatalysts were synthesized from commercially available α-amino acids. The structural modularity of these catalysts permits facile tunings to achieve optimum results, which was demonstrated