comparison to THB thus to identify the most effective against free radical-induced oxidative injury, by using three different antioxidant tests: the ORAC method, the DNA nicking assay, and the DCFH-DA cellular assay. As a result, PTHB 4d emerged among the other THB analogues by exhibiting the best antioxidant properties. First, it was the only compound having an ORAC value completely comparable to that of
四氢小ber碱(THB),也称为卡达丁(canadine),是一种天然生物碱,显示出显着的药理特性和抗氧化损伤的抗氧化保护作用。本文中,我们通过1,2-二氮杂-1,3-二烯的反应合成了结构复杂的THB类似物,即吡咯烷-四氢小ine碱(PTHBs)4a-g,其中含有吡咯并[2,3- b ]吡啶体系。和7,8-二氢小ber碱。该研究的目的是探索与THB相比PTHBs的体外抗氧化特性,从而通过使用三种不同的抗氧化剂测试来鉴定最有效的抗自由基诱导的氧化损伤的方法:ORAC方法,DNA缺口分析和DCFH-DA细胞分析。结果,PTHB 4d通过表现出最佳的抗氧化性能,在其他THB类似物中脱颖而出。首先,它是唯一具有与THB完全可比的ORAC值的化合物,表明具有相同的中和过氧自由基的能力。其次,在保护DNA免受亚铁离子诱导的链断裂方面,4d表现出比THB更好的抗氧化能力。这些观察结果在暴露于过氧化氢的N
Zn(II)-Catalyzed Addition of Aromatic/Heteroaromatic C(sp<sup>2</sup>)–H to Azoalkenes: A Polarity-Reversed Arylation of Carbonyl Compounds
作者:Cecilia Ciccolini、Lucia De Crescentini、Fabio Mantellini、Stefania Santeusanio、Gianfranco Favi
DOI:10.1021/acs.orglett.9b01628
日期:2019.6.7
An umpolung α-(hetero)arylation strategy that involves the Michael-type reaction between electron-rich (hetero)aromatic substrates and azoalkenes is developed. The reaction proceeds under very mild conditions at room temperature and in the presence of inexpensive, nontoxic ZnCl2 catalyst to provide access to otherwise inaccessible hydrazone structures. Subsequent hydrolysis of these latter to ketones
Synthesis of Functionalized Pyrroles via Catalyst- and Solvent-Free Sequential Three-Component Enamine−Azoene Annulation
作者:Orazio A. Attanasi、Gianfranco Favi、Fabio Mantellini、Giada Moscatelli、Stefania Santeusanio
DOI:10.1021/jo200287k
日期:2011.4.15
A new and efficient synthesis of polysubstituted pyrroles by a sequential one-pot three-componentreaction between primary aliphatic amines, active methylene compounds, and 1,2-diaza-1,3-dienes (DDs) is reported. The reactions were performed without catalyst and under solvent-free conditions with complete control of pathway selectivity. Notably, the ready availability of the starting materials and