intermediates with deconjugated butenolides and azlactones were accomplished by using a novelchiral hybrid P,S‐ligand and hydrogen bonding. By doing so, highly functionalized, optically active dihydroquinol‐2‐ones were produced with generally high reaction efficiencies and selectivities. Preliminary DFT calculations were performed to explain the high enantio‐ and diastereoselectivities.
which demonstrated that the introduced butenolide skeleton improved the binding affinity to OfChtI. Moreover, the in vivo activity assay indicated that these compounds also displayed moderate insecticidalactivity toward O. furnacalis. This work introduces the natural product piperine as a starting point for the development of novelinsecticides targeting OfChtI.
昆虫几丁质酶中来自农业害虫ChtI玉米螟(亚洲玉米螟)是绿色杀虫剂设计一个有前途的目标。的ChtI是在蜕皮的阶段中的几丁质表皮劣化的临界几丁质酶。在这项研究中,胡椒碱,来自黑胡椒分离的天然的酰胺化合物,胡椒L.,发现首次具有抑制活性的朝向中ChtI。推测化合物-酶相互作用发生在胡椒碱苯并[ d ][1,3]二氧杂环戊烷骨架和Of底物结合口袋的亚位点-1之间。ChtI。因此,在推断的ChtI底物结合腔的抑制机制和晶体结构的基础上,通过将丁烯内酯支架引入先导化合物胡椒碱设计并合成了化合物5a - f。酶活性测定表明,化合物5A - ˚F(ķ我= 1.03-2.04μM)表现出大约40-80倍比引线化合物胡椒碱更高的抑制活性(我)(ķ我= 81.45μM)朝向中ChtI。胡椒基丁烯酸内酯化合物的抑制机理是通过分子动力学,这表明导入的丁烯酸内酯骨架提高到的结合亲和力阐明中ChtI。此外,体内活性测定表明这些化合物还显示出对O
Diastereo- and enantioselective direct vinylogous Michael addition of γ-substituted butenolides to 2-enoylpyridines catalyzed by chiral bifunctional amine-squaramides
The diastereo- and enantioselectivedirectvinylogousMichaeladdition reaction of [gamma]-substituted butenolides to 2-enoylpyridines has been achieved. A range of [gamma],[gamma]-disubstituted butenolide derivatives, bearing two consecutive tri- and tetrasubstituted stereogenic...
Using 1-thioaurones and 1-azaaurones as electron-deficient oxa-dienes, an organocatalyticasymmetric aromatizing inverse electron-demand [4+2] cycloaddition with γ-deconjugated butenolides and azlactones was developed. A wide range of opticallyactive benzothiophene-fused δ-lactones and indole-fused δ-lactones were obtained with desirable outcomes (up to 94% yield, >99 : 1 dr and 99% ee).
以1-硫代金酮和1-氮杂金酮作为缺电子氧杂二烯,开发了γ-去共轭丁烯内酯和吖内酯的有机催化不对称芳构化逆电子需求[4+2]环加成反应。以理想的结果获得了范围广泛的光学活性苯并噻吩稠合 δ-内酯和吲哚稠合 δ-内酯(高达 94% 的产率,>99:1 dr 和 99% ee)。
Base-catalyzed bis-sulfenylation of γ-substituted butenolides for the synthesis of α,α-bisthiofunctionalized butenolide derivatives
synthesis of α,α-bisthiofunctionalized butenolide compounds has been successfully developed. The bis-sulfenylation of γ-substituted butenolides at α-position is promoted by using triethylamine as the catalyst and N-(aryl(alkyl)sulfanyl)succinimides or N-(phenylsulfanyl)phthalimides as sulfenylating reagents under mild reaction conditions. A range of α-sulfenylated butenolide derivatives could be smoothly obtained