Copper-Catalyzed Borylative Multicomponent Synthesis of Quaternary α-Amino Esters
作者:Kay Yeung、Fabien J. T. Talbot、Gareth P. Howell、Alexander P. Pulis、David J. Procter
DOI:10.1021/acscatal.8b04563
日期:2019.3.1
Copper-catalyzed coupling of readily available ketiminoesters, allenes, and a diboron affords densely functionalized quaternary α-amino esters bearing adjacent stereocenters and versatile vinyl boronate motifs. The method utilizes a commerciallyavailable copper(I) catalyst, operates at ambient temperature, and features a catalytic allyl cupration of ketiminoesters.
A series of non-nucleoside reverse transcriptase inhibitors derived from indole-based α-amino acids were designed and synthesized. Their inhibitory activities were detected by a TZM-bl cell assay on HIV virus type HIV-1IIIB. The comprehensive understanding of the SAR was obtained by utilizing the variation of the substituents of the indole-based α-amino acids. From the screened compounds, the novel inhibitors 19 and 29 were identified to be highly potent candidates with EC50 values of 0.060 μM and 0.045 μM respectively (CC50 values of 109.545 μM and 49.295 μM and SI values of 1825.8 and 1095.4). In most cases, the variation of substituents at different positions had a significant effect on the potency of activities. The results also indicate that the indole-based α-amino acids as efficient NNRTIs displayed comparable anti-HIV-1 activities to the reference drug NVP. We hope the identification of these indole-based amino acids as efficient NNRTIs of RT could stimulate researchers to develop more diversified anti-HIV drugs.
Copper(I)-Catalyzed Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides with Fluorinated Imines: The Expanded Scope and Mechanism Insights
作者:Liang Wei、Qing-Hua Li、Chun-Jiang Wang
DOI:10.1021/acs.joc.8b01743
日期:2018.10.5
The mechanism of the Cu(I)/(S,Rp)-PPFOMe-catalyzed 1,3-dipolar cycloaddition of azomethine ylides with fluorinated aldimines has been studied using labeling experiments, control experiments, and linear effect experiments, which clearly ruled out the 1,3-DC/epimerization pathways and explained the unusal exo′-selective stereochemistry. This protocol allows for the preparation of a series of highly functionalized
使用标记实验,对照实验和线性效应实验研究了Cu(I)/(S,R p)-PPFOMe催化的1,3-偶极环偶氮亚甲基与氟化亚胺的加成反应的机理,明确排除了1,3- DC /差向异构化途径和解释了此项特殊的外切' -选择性的立体化学。该方案允许以良好的产率和优异的立体选择性制备一系列高度官能化的氟化咪唑烷。而且,目前的方法已经成功地扩展到通过内含物合成具有挑战性的,带有CF 3的季立构中心的咪唑烷类化合物。在相同的反应条件下,用三氟化酮亚胺对甲亚胺烷基化物进行1,3-DC选择性合成。
Zinc-mediated enantioselective addition of terminal 1,3-diynes to N-arylimines of trifluoropyruvates
作者:Fa-Guang Zhang、Hai Ma、Yan Zheng、Jun-An Ma
DOI:10.1016/j.tet.2012.05.086
日期:2012.9
A facile and effective enantioselectiveaddition of terminal 1,3-diynes to acyclic α-CF3 ketimine esters has been developed by using zinc/Binol complexes. The reaction works well with a variety of aromatic-, aliphatic- and silyl-substituted diynes, providing the desired products in up to 97% yield and 97% enantiomeric excess.
Asymmetric synthesis of quaternary α-amino acid derivatives and their fluorinated analogues
作者:Santos Fustero、María Sánchez-Roselló、Claribel Báez、Carlos del Pozo、José L. García Ruano、José Alemán、Leyre Marzo、Alejandro Parra
DOI:10.1007/s00726-011-0881-7
日期:2011.8
In this work, we describe the asymmetricsynthesis of a series of fluorinated and non-fluorinated quaternary α-amino acid derivatives. This methodology involves the diastereoselective addition of chiral 2-p-tolylsulfinyl benzylcarbanions to either imines containing a 2-furyl moiety or trifluoromethyl α-imino esters. Synthetic practicality of this method is demonstrated by short (two-steps) and convenient