A macrocyclic coumarin-containing tripeptide via CuAAC chemistry
作者:Sander S. van Berkel、Bas van der Lee、Floris L. van Delft、Floris P. J. T. Rutjes
DOI:10.1039/b906762k
日期:——
A Cu-catalysed macrocyclisation was performed to obtain a macrocyclic coumarin-containing tripeptide for use in thrombin activity measurements.
进行了一项铜催化的环化反应,以获得一种含有香豆素的环状三肽,用于凝血酶活性测定。
PIFA-Promoted, Solvent-Controlled Selective Functionalization of C(sp<sup>2</sup>)–H or C(sp<sup>3</sup>)–H: Nitration via C–N Bond Cleavage of CH<sub>3</sub>NO<sub>2</sub>, Cyanation, or Oxygenation in Water
作者:Chandrashekar Mudithanapelli、Lama Prema Dhorma、Mi-hyun Kim
DOI:10.1021/acs.orglett.9b00751
日期:2019.5.3
CH3NO2) mediated by [bis(trifluoroacetoxy)iodo]benzene (PIFA) is described. The NO2 transfer from CH3NO2 to the aromatic group of the substrate is possible with careful selection of the solvent, NaX, and oxidant. In addition, the solvent-controlled C(sp2)–H functionalization can shift to an α-C(sp3)–H functionalization (cyanation or oxygenation) of the α-C(sp3)–H of cyclic amines.
描述了由[双(三氟乙酰氧基)碘]苯(PIFA)介导的新型硝化作用(通过C(sp 3)–N破坏/ C(sp 2)–N与CH 3 NO 2形成)。的NO 2从CH转印3 NO 2到基板的芳族基团是可能的溶剂,的NaX,和氧化剂的仔细选择。此外,溶剂控制的C(SP 2)-H官能化可转移到一个α-C(SP 3)-H官能的α-C(SP的(氰化或氧合)3)-H的环胺。
Promising Fungicides from Allelochemicals: Synthesis of Umbelliferone Derivatives and Their Structure–Activity Relationships
作者:Le Pan、Dongyu Lei、Lu Jin、Yuan He、Qingqing Yang
DOI:10.3390/molecules23113002
日期:——
of its activity and structure has not yet been revealed. In this study, a series of analogues were synthesized to determine the skeleton of umbelliferone and examine its fungicidalactivity. Furthermore, targeted modifications were conducted with three plant parasitic fungi to examine the lead compounds. Among those tested, compounds 2f and 10 were found to show excellent antifungal activity with an
伞形酮在我们先前的研究中被发现是一种重要的化感物质,但其活性和结构的贡献尚未揭示。在这项研究中,合成了一系列类似物以确定伞形酮的骨架并检查其杀真菌活性。此外,用三种植物寄生真菌进行了有针对性的修饰,以检查先导化合物。在测试的化合物中,发现化合物2f和10具有出色的抗真菌活性,在100 ug / mL时抑制率超过80%。该研究证明伞形酮可以作为发现杀菌剂的有前途的骨架。此外,其一级结构活性关系为将来发现基于天然产物的新型杀菌剂提供了很好的指导。
Synthesis of Benzyl Amines via Copper-Catalyzed Enantioselective Aza-Friedel–Crafts Addition of Phenols to <i>N</i>-Sulfonyl Aldimines
作者:Jonathan M. Shikora、Sherry R. Chemler
DOI:10.1021/acs.orglett.8b00282
日期:2018.4.20
copper-catalyzed enantioselective aza-Freidel-Crafts reaction between phenols and N-sulfonyl aldimines that provides chiral secondary benzylamines in good to excellent yields and excellent enantioselectivities (up to 99% ee) is disclosed. In particular, excellent scope with alkylimines was observed for the first time. The synthetic utility of the products was demonstrated in the first enantioselective synthesis
compounds have been used as fungicides for half a century, and dozens of varieties have been developed so far. This study focused on the introduction of carboxamide and sulfonamide moieties in a coumarin core to discover novel derivatives. Based on this strategy, we synthesized two series of novel carboxamide and sulfonamide substituted coumarin derivatives, and their fungicidal activity was also investigated