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.
palladium-catalyzed three-component cascade reaction has been developed for the facile construction of phenanthrene frameworks. The transformation is driven by a controlled reaction sequence of Suzuki–Miyaura coupling followed by the insertion of alkynes, and finally, annulation to yield phenanthrene derivatives via C–H activation. This methodology is able to accommodate a variety of substrates and affords
The present invention relates to benzo[b]furane and benzo[b]thiophene derivatives of the general formula IV as the free base or salts thereof and their use.
本发明涉及通用公式IV的苯并[b]呋喃和苯并[b]噻吩衍生物作为自由碱或其盐,及其用途。
Synthesis of Divergent Benzo[<i>b</i>]fluorenones through Cycloaromatization Reactions of 1,5-Enynols and 1,5-Diynols
作者:Bingyu Yan、Yang Fu、Hui Zhu、Zhiyuan Chen
DOI:10.1021/acs.joc.9b00231
日期:2019.4.5
A facile and efficient synthesis of divergent benzo[b]fluorenones is described through the use of dichlorobenzoquinone-promoted oxidative cycloaromatization reactions of acyclic 1,5-enynols and 1,5-diynols. The success of these cascadereactions depends on the chemoselectivity of the initial Meyer–Schuster rearrangement to produce allenol intermediate, which is followed by regioselective Schmittel
通过使用二氯苯醌促进的无环1,5-烯醇和1,5-二炔醇的氧化环芳构化反应,描述了发散的苯并[ b ]芴酮的简便高效合成方法。这些级联反应的成功取决于初始Meyer-Schuster重排产生烯丙醇中间体的化学选择性,随后是区域选择性的Schmittel环化反应,以及随后的Friedal-Crafts烷基化反应或末端Ar部分的自由基进攻。反应中仅需要氧化剂和溶剂,因此在不含金属的条件下提供了一个小的库,具有所需的具有优异的官能团耐受性的预期多碳环产物。选定的苯并[ b]的吸收和光致发光特性还研究了芴酮。结果表明,在苯基部分包含给电子体4-OMe基团的化合物(2h)显示出深绿色发射光(491nm)。
9-Silafluorenyl Dichlorides as Chemically Ligating Coupling Agents and Their Application in Peptide Synthesis
作者:Samuel J. Aspin、Sylvain Taillemaud、Patrick Cyr、André B. Charette
DOI:10.1002/anie.201606120
日期:2016.10.24
A fundamentally simple, mild, and practicalprocedure for peptide bond formation is reported that employs a stoichiometric amount of easy‐to‐access 9‐silafluorenyl dichlorides as the coupling agent. Without initial preactivation or elaboration of the carboxylic acid or amine termini of the amino acids, the developed reagent is proposed to act through an unprecedented chemical ligation mechanism, bringing