β-内酯亲电体会与多种基于氮的亲核体发生区域选择性加成-消除(AE)或S N 2开环。伯胺和仲胺可促进AE开环,从而提供功能上与酰胺醇醛加合物相同的产品。叠氮化物和磺酰胺阴离子亲核试剂使S N 2内酯开环传递N保护的β-氨基酸衍生物。这些依赖亲核试剂的开环途径,再加上通过酰基卤-醛环缩合反应获得的富含大量庚酮的β-内酯的便捷途径,构成了不对称有机合成的通用方法。还描述了该反应技术在基于从AAC开环序列中出现的旋光性β-叠氮酸的β肽合成新方法中的应用。
β-内酯亲电体会与多种基于氮的亲核体发生区域选择性加成-消除(AE)或S N 2开环。伯胺和仲胺可促进AE开环,从而提供功能上与酰胺醇醛加合物相同的产品。叠氮化物和磺酰胺阴离子亲核试剂使S N 2内酯开环传递N保护的β-氨基酸衍生物。这些依赖亲核试剂的开环途径,再加上通过酰基卤-醛环缩合反应获得的富含大量庚酮的β-内酯的便捷途径,构成了不对称有机合成的通用方法。还描述了该反应技术在基于从AAC开环序列中出现的旋光性β-叠氮酸的β肽合成新方法中的应用。
Diastereoselective Coupling of<i>N</i>-(<i>tert</i>-Butyl)sulfinyl Imines and Dimethyl Malonate. Synthesis of Enantiomerically Enriched<i>β</i>-Amino Esters and<i>β</i>-Lactams
作者:Haythem K. Dema、Francisco Foubelo、Miguel Yus
DOI:10.1002/hlca.201200303
日期:2012.10
A diastereoselectivecoupling of dimethylmalonate with N‐(tert‐butyl)sulfinylimines under solvent‐free conditions was developed, using NaHCO3 or NaI as base promoters. The resulting dimethyl 2‐(1‐aminoalkyl)malonates could be easily transformed successively to β‐amino esters and the corresponding β‐lactams with high optical purity.
Crystal structures of reversible ketone-Based inhibitors of the cysteine protease cruzain
作者:Lily Huang、Linda S. Brinen、Jonathan A. Ellman
DOI:10.1016/s0968-0896(02)00427-3
日期:2003.1
The crystal structures of two hydroxymethyl ketone inhibitors complexed. to the cysteine protease cruzain have been determined at 1.1 and 1.2 Angstrom resolution, respectively. These high resolution crystal structures provide the first structures of non-covalent inhibitors bound to cruzain. A series of compounds were prepared and tested based upon the structures providing further insight into the key binding interactions. (C) 2002 Elsevier Science Ltd. All rights reserved.