A Concise Asymmetric Synthesis of cis-2,6-Disubstituted N-Aryl Piperazines via Pd-Catalyzed Carboamination Reactions
摘要:
A concise, modular, asymmetric synthesis of cis-2,6-disubstituted piperazines from readily available amino acid precursors is described. The key step in the synthesis is a Pd-catalyzed carboamination of a N-1-aryl-N-2-allyl-1,2-diamine with an aryl bromide. The products are obtained in 14-20:1 dr, with > 97% ee, and the key cyclizations are the first examples of six-membered ring formation via Pd-catalyzed carboamination reactions of unsaturated amines with aryl halides.
发现富含地球的镍与合适的手性双膦配体配合使用,是2-酰胺基丙烯酸酯不对称氢化的有效催化剂,以定量收率和优异的对映选择性(高达96%ee)提供了手性α-氨基酸酯。通过NMR和HRMS对活性催化剂组分进行了研究,这有助于我们以克级实现高催化效率且催化剂负载量低(S / C = 2000)。氢化产物可以简单地转化为手性α-氨基酸,β-氨基醇及其生物活性衍生物。此外,使用氘标记实验和计算计算研究了催化机理。
A series of structurally novel proteasome inhibitors 1–12 have been developed based rational topology-based scaffold hopping of bortezomib. Among these novel proteasome inhibitors, compound 10 represents an important advance due to the comparable proteasome-inhibitory activity (IC50 = 9.7 nM) to bortezomib (IC50 = 8.3 nM), the remarkably higher BEI and SEI values and the effectiveness in metabolic
[EN] ALKALOID AMINOESTER DERIVATIVES AND MEDICINAL COMPOSITION THEREOF<br/>[FR] DÉRIVÉS AMINOESTÉRIFIÉS D'ALCALOÏDES ET COMPOSITION MÉDICINALE LES INCLUANT
申请人:CHIESI FARMA SPA
公开号:WO2010072338A1
公开(公告)日:2010-07-01
The present invention relates to alkaloid aminoester derivatives acting as muscarinic receptor antagonists, to methods of preparing such derivatives, to compositions comprising them and therapeutic use thereof.
showed high efficiency for the couplingreactions of aminoacids and inactive aryl halides to give N-aryl aminoacids. Under the catalytic conditions, not only α-amino acids, but also β-, γ-, and δ-amino acids have been coupled with aryl chlorides in moderate to high yields; in the case of optically pure β-amino acids as substrates, the optical purities of the coupling products retained.
Room temperature N-arylation of amino acids and peptides using copper(<scp>i</scp>) and β-diketone
作者:Krishna K. Sharma、Swagat Sharma、Anurag Kudwal、Rahul Jain
DOI:10.1039/c5ob00288e
日期:——
A mild and efficient method for the N-arylation of zwitterionic amino acids, amino acid esters and peptides is described. The procedure provides the first roomtemperature synthesis of N-arylated amino acids and peptides using CuI as a catalyst, diketone as a ligand, and aryliodides as coupling partners. The method is equally applicable for using relatively inexpensive aryl bromides as coupling partners