描述了设计为手性非平面杂环羧酸生物电子等排体的芳基取代环状磺酰亚胺酰胺的有效合成。环状磺酰亚胺环系统可以由三氟乙酰基保护的亚磺酰胺和甲基酯保护的氨基酸分两步制备。通过改变氨基酸,可以制备一系列不同的 C-3 取代的磺酰亚胺酰胺。可以使用标准的交叉偶联反应在芳环中进一步衍生化合物,以优异的产率产生高度取代的环状磺酰亚胺酰胺。检查了最终化合物的物理化学性质,并将其与相应的羧酸和四唑衍生物的物理化学性质进行了比较。独特的非平面形状与相对较强的酸度 (p K a 5-6) 以及修改化学结构以微调理化性质的便利性表明,这种杂环可以成为可用羧酸等排体范围的有价值的补充。
initially the fabrication of a single-atom photocatalyst Ni/TiO2 for the visible-light-induced site-selective sulfonation of enamides to give amidosulfones with 36 examples up to 99% yield. The experimental results show that this single-atom photocatalyst Ni/TiO2 can achieve site-selective sulfonation of enamide to construct α-amidosulfones and β-propionamidosulfones under visible light. Importantly, such
单原子光催化作为一种重要的有机转化策略已受到越来越多的关注,其性能很大程度上取决于催化剂的设计。该方案最初涉及制造单原子光催化剂Ni / TiO 2,用于可见光诱导的酰胺的位点选择性磺化,以产生酰胺化砜,其中36个实例的收率高达99%。实验结果表明,该单原子光催化剂Ni / TiO 2可以在可见光下实现酰胺的定点磺化,从而构建α-酰胺基砜和β-丙酰胺基砜。重要的是,这种基于单原子光催化的合成系统显示出良好的可回收性,高周转数(最多18 963),对官能团的优异耐受性,并且可以容易地按比例放大并具有良好的效率。
Visible-Light Photocatalytic Bicyclization of 1,7-Enynes toward Functionalized Sulfone-Containing Benzo[<i>a</i>
]fluoren-5-ones
A new visible‐light photocatalytic arylsulfonylation and bicyclization of C(sp3)‐tethered 1,7‐enynes with sulfinic acids has been developed, delivering functionalized sulfone‐containing benzo[a]fluoren‐5‐ones with generally good yields. This Eosin Y‐catalyzed approach makes use of visible light as a safe and eco‐friendly energy source to drive cascade cyclization reactions, resulting in continuous
已开发出一种新的可见光光催化芳基磺酰化和C(sp 3)系的1,7-烯炔与亚磺酸的双环化,可提供官能化的含砜苯并[ a ]芴-5酮,且收率普遍良好。这种曙红Y催化方法利用可见光作为一种安全且生态友好的能源来驱动级联环化反应,从而导致连续的多个成键事件(包括C–S和C–C键)有效地构建多环连接的烷基芳基砜。
<i>tert</i>
‐Butyl Hydroperoxide‐Initiated Radical Cyclization of 1‐(Allyloxy)‐2‐(1‐Arylvinyl)Benzenes with Sulfinic Acids to Access Sulfonated Benzoxepines
A tert-butyl hydroperoxide-initiated radical cyclization of 1-(allyloxy)-2-(1-arylvinyl)benzenes with sulfinic acids for the construction of sulfonated benzoxepines is developed. This reaction involves a radical pathway and offers a straightforward route to the formation of seven-memberedring via sulfonylation/cyclization process. This methodology features mild reaction conditions, a broad substrate
The electrochemical in-situ oxidative sulfonylation of phenols with sulfinicacids access to sulfonylated hydroquinones has been developed. A series of sulfonylated hydroquinones were prepared under mild mediator-, catalyst- and exogenous-oxidant-free conditions. Notably, such an electrochemical in-situ-oxidative synthetic strategy presented wide functional group tolerance and amenability to gram-scale
photochemical multi-component tandem reaction of quinoxalin-2(1H)-ones, alkenes and sulfinic acids is reported. This tandem reaction could be conveniently carried out at roomtemperature by employing 4CzIPN as the metal-free photocatalyst and dioxygen (air) as the environmentally benign oxidant. A number of sulfonated quinoxalin-2(1H)-ones were obtained in satisfactory yields with favorable functional
报道了一种温和高效的喹喔啉-2(1 H )-酮、烯烃和亚磺酸的光化学多组分串联反应。通过使用 4CzIPN 作为无金属光催化剂和双氧(空气)作为环境友好的氧化剂,这种串联反应可以在室温下方便地进行。以令人满意的收率获得了许多磺化的喹喔啉-2(1 H )-酮,具有良好的官能团耐受性。进行自由基捕获实验和荧光猝灭实验以阐明这种可见光介导的自由基反应过程。