已经开发了在温和的反应条件下伯酰胺的两步催化酰胺转化为酯的方法。甲叔丁基烟酸甲酯(吨卜NIC)指示组很容易通过Pd催化的酰胺化与引入到伯酰胺叔丁基2-氯烟。如果选择1,1'-双(二环己基膦基)二茂铁作为配体,则可以使用40–50°C的弱碱(Cs 2 CO 3或K 2 CO 3)。所述吨卜NIC活化酰胺随后允许的Zn(OAc)2催化的醇解nonsolvolytic在吨在中性反应条件下于40–60°C的BuOAc。激活机制是仿生的:在引导基团中吡啶的C3酯取代基构成了适合Zn螯合的反式构象异构体,C═O酰胺-Zn-N引导基团,并且Zn配位醇还被激活为亲核试剂通过氢键与催化剂的乙酸酯配体键合。另外,乙酸盐配体有助于分子内O至N质子转移。化学选择性相对于其他官能团以及与具有挑战性的反应伙伴(如肽,糖和固醇)的相容性说明了这种两步酰胺裂解方法的合成适用性。该Ť卜NIC酰胺在裂解前不需要纯化。初步实验
[EN] PROCESS FOR THE CATALYTIC DIRECTED CLEAVAGE OF AMIDE-CONTAINING COMPOUNDS<br/>[FR] PROCÉDÉ POUR LE CLIVAGE CATALYTIQUE DIRIGÉ DE COMPOSÉS CONTENANT UN AMIDE
申请人:UNIV ANTWERPEN
公开号:WO2017046133A1
公开(公告)日:2017-03-23
The present invention relates to a catalytic method for the conversion of amide-containing compouds by means of a build-in directing group and upon the action of a heteronucleophilic compound (in se an amine (RNH2 or RNHR') or an alcohol (ROH) or a thiol (RSH)) in the presence of a metal catalyst to respectively esters, thioesters, carbonates, thiocarbonates and to what is defined as amide-containing compounds (such as carboxamides, urea, carbamates, thiocarbamates). The present invention also relates to these amide-containing compounds having a build-in directing group (DG), as well as the use of such directing groups in the catalytic directed cleavage of N-DG amides with the use of heteronucleophiles (in se an amine (RNH2 or RNHR') or an alcohol (ROH) or thiol (RSH)).
Zn-Catalyzed Nicotinate-Directed Transamidations in Peptide Synthesis
作者:Charlie Hollanders、Evelien Renders、Charlène Gadais、Dario Masullo、Laurent Van Raemdonck、Clarence C. D. Wybon、Charlotte Martin、Wouter A. Herrebout、Bert U. W. Maes、Steven Ballet
DOI:10.1021/acscatal.9b05074
日期:2020.4.3
transamidation for peptide synthesis is described. Transamidation under Zn catalysis is chemoselectively achieved by amino acidamide/peptidic amide derivatization with a tert-butyl nicotinate (tBu-nic) directing group. The directing group could be easily introduced on protected amino acidamides via Pd-catalyzed amidation with tert-butyl 2-chloronicotinate (tBu-nicCl). Under standard peptide coupling/deprotection
The present invention provides a compound of formula (I) having BACE1 inhibitory activity, their manufacture, pharmaceutical compositions containing them and their use as therapeutically active substances. The active compounds of the present invention are useful in the therapeutic and/or prophylactic treatment of e.g. Alzheimer's disease.
Nf-kappa b inhibitor containing substituted benzoic acid derivative as active ingredient
申请人:——
公开号:US20040122244A1
公开(公告)日:2004-06-24
A novel NF-&kgr;B inhibitor represented by the following formula (I) is provided.
1
提供了一种以以下公式(I)表示的新型NF-κB抑制剂。1
PHENYLALANINE DERIVATIVES
申请人:Arnould Jean-Claude
公开号:US20080045521A1
公开(公告)日:2008-02-21
The present invention relates to compounds that inhibit of a5b1 function, processes for their preparation, pharmaceutical compositions containing them as the active ingredient, to their use as medicaments and to their use in the manufacture of medicaments for use in the treatment in warm-blooded animals such as humans of diseases that have a significant angiogenesis or vascular component such as for treatment of solid tumours. The present invention also relates to a5b1 antagonists that also exhibit appropriate selectivity profile(s) against other integrins.