Direct synthesis of dialkylarylvinylsilane derivatives: metathesis of dialkylaryl-iso-propenylsilane and its application to tetracyclic silacycle dye synthesis
The metathesis of dialkylarylvinylsilane, which has not been accomplished to date, is achieved using dialkylaryl-iso-propenylsilane as a substrate. In addition, we discovered that the reason why the metathesis of a ruthenium carbene complex and dialkylarylvinylsilane is difficult is the formation of a carbide complex.
A new triflicacid (TfOH)‐mediatedcascadecyclization of ortho‐anisole‐substituted aryldiynes is described for the construction of indeno[1,2‐c]chromenes. The cascadecyclization proceeds through an unusual TfOH‐induced alkyne‐alkyne cyclization followed by nucleophilic attack of the methoxy group on the benzylidene cation, which is completely different to the cyclization of ortho‐aniline‐ or ort
描述了一种新的由三氟甲磺酸(TfOH)介导的邻苯甲醚取代的芳基二炔的级联环化反应,用于构建茚并[1,2- c ]苯二酮。级联环化是通过不寻常的TfOH诱导的炔烃-炔烃环化进行的,随后甲氧基对苄叉基阳离子的亲核攻击,这与邻苯胺或邻苯硫基苯甲醚取代的芳基二炔的环化完全不同。合成了以茚并[1,2- c ]亚甲基骨架为供体和π-连接基的一类新型有机染料。这些化合物在染料敏化太阳能电池(DSC)中表现出很高的光伏性能。
A Regio- and Stereoselective Carbonylative Approach to Alkyl (<i>Z</i>
)-2-[3-Oxoisobenzofuran-1-(3<i>H</i>
)-ylidene]acetates
作者:Raffaella Mancuso、Ida Ziccarelli、Francesco Fini、Nicola Della Ca'、Nadia Marino、Carla Carfagna、Bartolo Gabriele
DOI:10.1002/adsc.201801308
日期:2019.2.19
The first example of the oxidative carbonylation of 2‐ethynylbenzoic acid derivatives, leading to alkyl (Z)‐2‐[3‐oxoisobenzofuran‐1‐(3H)‐ylidene]acetates in a regio‐ and stereoselective manner, is reported. Under the catalytic action of PdI2 (2 mol%) in conjuction with KI (20 mol%), different 2‐[(trimethylsilyl)ethynyl]benzoic acids were converted into the corresponding isobenzofuranones in high to
ruthenium complex catalyzes a new cycloisomerization reaction of 2,2′‐diethynylbiphenyls to form 9‐ethynylphenanthrenes, thereby cleaving the carbon–carbon triple bond of the original ethynyl group. A metal–vinylidene complex is generated from one of the two ethynyl groups, and its carbon–carbon double bond undergoes a [2+2] cycloaddition with the other ethynyl group to form a cyclobutene. The phenanthrene
important. However, we have limited knowledge of the nature of these six-membered silacycles because methodologies for their synthesis remain under-developed. Here, we have developed a one-pot enynemetathesis/Diels–Alder/oxidation methodology for the synthesis of six-membered silacycles. Some of these compounds are novel fluorophores.