Heterocyclic rimantadine analogues with antiviral activity
摘要:
2-(1-Adamantyl)-2-methyl-pyrrolidines 3 and 4, 2-(1-adamatityl)-2-methyl-azetidines 5 and 6, and 2-(1-adamantyl)-2-methyl-aziridines 7 and 8 were synthesized and tested for their antiviral activity against influenza A. Parent molecules 3, 5, and 7 contain the alpha-methyl-1-adimantan-methanamine 2 pharmacophoric moiety (rimantadine). The ring size effect on anti-influenza A activity was investigated. Pyrrolidine 3 was the most potent anti-influenza virus A compound, 9-fold more potent than rimantadine 2, 27-fold more potent than amantadine 1, and 22-fold more potent than ribavirin. Azetidines 5 and 6 were both markedly active against influenza A H2N2 virus, 10- to 20-fold more potent than amantadine. Aziridine 7 was almost devoid of any activity against H2N2 virus but exhibited borderline activity against H3N2 influenza A strain. Thus, it appears that changing the five-, to four- to a three-membered ring results in a drop of activity against influenza A virus. (c) 2006 Elsevier Ltd. All rights reserved.
methylenation of acyl fluorides and acyl chlorides with substituted with aryl, alkenyl, and alkyl groups trimethylaluminum afforded an array of 2-substituted propene derivatives. The addition of a catalytic amount of DPPM increased an efficiency of the reactions. Trimethylaluminum as the methylenation reagent not only eliminates the presynthesis of methylene transfer reagent, but provides an efficient method for
Hydroalkylation of Unactivated Olefins via Visible-Light-Driven Dual Hydrogen Atom Transfer Catalysis
作者:Guangyue Lei、Meichen Xu、Rui Chang、Ignacio Funes-Ardoiz、Juntao Ye
DOI:10.1021/jacs.1c05852
日期:2021.7.28
hydroalkylation of olefins enabled by hydrogen atom transfer (HAT) catalysis represents a straightforward means to access C(sp3)-rich molecules from abundant feedstock chemicals without the need for prefunctionalization. While Giese-type hydroalkylation of activated olefins initiated by HAT of hydridic carbon–hydrogen bonds is well-precedented, hydroalkylation of unactivated olefins in a similar fashion
通过氢原子转移 (HAT) 催化实现的烯烃自由基加氢烷基化代表了一种直接获得 C( sp 3)-丰富的分子来自丰富的原料化学品,无需预官能化。虽然由氢化碳-氢键的 HAT 引发的活性烯烃的 Giese 型加氢烷基化是有先例的,但未活化烯烃以类似方式的加氢烷基化仍然难以捉摸,主要是由于缺乏克服固有极性不匹配的通用方法。设想。在这里,我们报告了使用可见光驱动的双 HAT 催化来实现这一目标,其中催化量的胺硼烷和原位生成的硫醇分别用作氢原子提取物和供体。该反应是完全原子经济的,具有广泛的范围。
Synthesis of Functionalized α‐Vinyl Aldehydes from Enaminones
An efficient RhII -catalyzed synthesis of functionalized α-vinyl aldehydes with high E/Z stereoselectivity was developed. The reaction mediates the cyclopropanation of enaminones with vinyl carbenoids that are generated from cyclopropenes in situ to give the aminocyclopropane intermediates. Selective C-C bond cleavage of the cyclopropane intermediates leads to formation of α-vinyl aldehyde derivatives
Titanium and Cobalt Bimetallic Radical Redox Relay for the Isomerization of N-Bz Aziridines to Allylic Amides
作者:Song Lin、Devin P. Wood、Weiyang Guan
DOI:10.1055/s-0037-1610779
日期:2021.11
Herein a bimetallic radical redox-relay strategy is employed to generate alkyl radicals under mild conditions with titanium(III) catalysis and terminated via hydrogen atom transfer with cobalt(II) catalysis to enact base-free isomerizations of N-Bz aziridines to N-Bz allylic amides. This reaction provides an alternative strategy for the synthesis of allylic amides from alkenes via a three-step sequence
ordinary Koch-Haaf carboxylation conditions the tertiary alcohol, 2-(1-adamantyl)-2-propanol (4) yields only the rearranged carboxylicacid, 3-isopropyl-1-adamantane carboxylicacid (5). Mechanistic evidence is presented which indicates that the rearrangement proceeds via intermolecular hydride shifts. A variety of synthetic approaches to the unrearranged 2-(1-adamantyl)-2-methylpropionic acid (1) are described