Palladium-Mediated Formation of Bowl-Shaped PAHs: Synthesis of <i>as</i>-Indaceno[3,2,1,8,7,6,-<i>p</i><i>qrstuv</i>]picenes
作者:Le Wang、Philip B. Shevlin
DOI:10.1021/ol006611d
日期:2000.11.1
Bowl-shaped fullerene fragments, as-indaceno[3,2,1,8,7, 6-pqrstuv]picenes, can be synthesized by a double palladium-mediated cyclization in good to excellent yield. The structure of 1, 8-dimethyl as-indaceno[3,2,1,8,7,6-pqrstuv]picene was confirmed by X-ray analysis. The high yields, mild reaction conditions, and wide range of functional group tolerance are advantages of this method over existing FVP
“Golden” Cascade Cyclization to Benzo[
<i>c</i>
]‐Phenanthridines
作者:Christoph M. Hendrich、Sebastian Senn、Lea Haas、Marvin T. Hoffmann、Ute Zschieschang、Luca C. Greiner、Frank Rominger、Matthias Rudolph、Hagen Klauk、Andreas Dreuw、A. Stephen K. Hashmi
DOI:10.1002/chem.202102134
日期:2021.10.21
substituted six-membered N-heterocycles using gold catalysis is reported. The applied cascade reaction using different substituted alkyne systems as starting materials furnished the corresponding benzo[c]phenanthridines in very high overall yields. In addition, two π-extended molecules were studied as organic semiconductors in organic thin-film transistors.
合适的取代:报道了使用金催化合成高度取代的六元 N-杂环。使用不同取代的炔烃系统作为起始材料的应用级联反应以非常高的总产率提供相应的苯并[ c ]菲啶。此外,研究了两个 π 扩展分子作为有机薄膜晶体管中的有机半导体。
Oxidative Cyclodimerization After Tandem Cyclization of Dehydrobenzo[14]annulenes Induced by Alkyllithium
After eight: Reactions of dehydrobenzo[14]annulenesinduced by the addition of n‐butyllithium led to the discovery of an unprecedented oxidativecyclodimerization, which forms eight‐membered ring products in up to 30 % yield. The product contains two indeno[2,1‐a]fluorene components connected by a single and a double bond, which result from three transannular bond formations.
八点之后:通过添加正丁基锂诱导的脱氢苯并[14]环戊烯的反应导致了前所未有的氧化环二聚反应的发现,该反应形成了八元环产物,收率高达30%。该产品包含两个通过单键和双键连接的茚并[2,1– a ]芴组分,这是由于三个跨环键形成所致。
Molecular design, chemical synthesis, kinetic studies, calculations, and biological studies of novel enediynes equipped with triggering, detection, and deactivating devices. Model dynemicin A epoxide and cis-diol systems
作者:K. C. Nicolaou、W. M. Dai、Y. P. Hong、K. K. Baldridge、J. S. Siegel、S. C. Tsay
DOI:10.1021/ja00071a003
日期:1993.9
A series of enediynemodelsystems of the dynemicin A type equipped with triggering and modulating/signaling devices were designed, synthesized, and studied. Specificaly, compounds 16, 18, 25, and 27 were synthesized via ring closures involving intramolecular acetylide additions to carbonyl groups followed by deoxygenation. Compounds 16 and 25 underwent cycloaromatization to systems 28 and 29, respectively
SuFEx-enabled, chemoselective synthesis of triflates, triflamides and triflimidates
作者:Bing-Yu Li、Lauren Voets、Ruben Van Lommel、Fien Hoppenbrouwers、Mercedes Alonso、Steven H. L. Verhelst、Wim M. De Borggraeve、Joachim Demaerel
DOI:10.1039/d1sc06267k
日期:——
Sulfur(VI) Fluoride Exchange (SuFEx) chemistry has emerged as a next-generation click reaction, designed to assemble functional molecules quickly and modularly. Here, we report the ex situ generation of trifluoromethanesulfonyl fluoride (CF3SO2F) gas in a two chamber system, and its use as a new SuFEx handle to efficiently synthesize triflates and triflamides. This broadly tolerated protocol lends
硫 ( VI ) 氟化物交换 (SuFEx) 化学已成为下一代点击反应,旨在快速、模块化地组装功能分子。在这里,我们报告了在两室系统中异位生成三氟甲磺酰氟(CF 3 SO 2 F)气体,并将其用作新的SuFEx手柄来有效合成三氟甲磺酸酯和三氟甲酰胺。这种广泛耐受的方案适用于肽修饰或伸缩到偶联反应中。此外,重新设计带有 S 的 S VI –F 连接器 奥 → 南 NR 取代提供了类似的三氟甲酰亚胺氟化物作为 SuFEx 亲电子试剂,其参与了罕见报道的三氟甲亚胺酯的合成。值得注意的是,实验表明 H 2 O 是实现苯酚与胺基化学选择性三氟甲磺化的关键,这一现象可以通过从头算动力学模拟通过胺的 CF 3 SO 2 F 三氟甲磺酸基化的氢键分子过渡态得到最好的解释。