[EN] PREPARATION OF PROTECTED ALPHA-KETO BETA-AMINO ESTERS AND AMIDES<br/>[FR] PRÉPARATION D'ESTERS ET D'AMIDES D'ALPHA-CÉTO-BÊTA-AMINO PROTÉGÉS
申请人:VERTEX PHARMA
公开号:WO2010002474A1
公开(公告)日:2010-01-07
The invention provides β-sulfonamide α-keto esters and amides in which the α-keto is protected as a 1,3-dithiolane derivative. Also provided are methods for preparing such esters and amides and for incorporating them into peptides.
A new asymmetric synthesis of (+)-12b-epidevinylantirhine
作者:Steven M. Allin、Jagjit S. Khera、Jason Witherington、Mark R.J. Elsegood
DOI:10.1016/j.tetlet.2006.06.033
日期:2006.8
We report a new asymmetric synthesis of the indole alkaloid derivative (+)-12b-epidevinylantirhine through stereoselective cyclization of a tethered indole nucleus onto an N-acyliminiumion intermediate, generated from a readily available non-racemic bicyclic lactam building block, and subsequent template modification through a highly diastereoselective conjugate addition protocol. In addition, we
我们报告了一个新的不对称合成的吲哚生物碱衍生物(+)-12 b -epidevinylantirhine通过从一个可用的非外消旋双环内酰胺结构单元生成的N- acyliminium离子中间体上的拴系的吲哚核的立体选择性环化通过高度非对映选择性共轭加成方案进行模板修饰。此外,我们介绍了这种吲哚靶的第一个X射线晶体结构。
Beyond the chiral pool: a general approach to β-amino-α-keto amides
作者:Cristian L. Harrison、Mariusz Krawiec、Raymond E. Forslund、William A. Nugent
DOI:10.1016/j.tet.2010.11.018
日期:2011.1
A simple route was developed for the synthesis of optically enriched beta-amino-alpha-keto amides. The highly diastereoselective addition of alkyl dithiolanecarboxylates to optically enriched sulfinimines affords the corresponding beta-amino-alpha-keto esters in which the ketone carbonyl group is protected as a dithiolane. Amidation of the ester functionality with a primary amine proceeds readily at room temperature. Treatment with HCl cleaves the N-S bond of the sulfinyl group to provide a free amine functionality, which can then be incorporated into a peptide. Removal of the dithiolane protecting group under oxidative conditions proceeds without epimerization as exemplified by a model dipeptide. (C) 2010 Elsevier Ltd. All rights reserved.