这项工作报告了2-炔基-1-羰基苯与乙烯基重氮酮的金催化双环环化反应,该酮可作为五个原子的构建单元。这些反应的重要性是获得形成各种生物活性分子结构核心的4,5-二氢苯并[ g ]吲唑。根据我们的机理分析,我们假设苯并吡咯中间体与乙烯基重氮酮之间先发生[5 + 4]-环加成反应,然后进行6-π-电环化以实现出色的立体选择性。
Gold(I)-Catalyzed Reactions between 2-(1-Alkynyl)-2-alken-1-ones and Vinyldiazo Ketones for Divergent Synthesis of Nonsymmetric Heteroaryl-Substituted Triarylmethanes: <i>N-</i> versus <i>C</i>-Attack Paths
作者:Rahul Dadabhau Kardile、Rai-Shung Liu
DOI:10.1021/acs.orglett.0c02765
日期:2020.11.6
Gold-catalyzed synthesis of nonsymmetrical heteroaryl-substitutedtriarylmethanes using 2-(1-alkynyl)-2-alken-1-ones and vinyldiazo ketones is described. In this catalytic sequence, vinyldiazo ketones attack gold-containing 3-furylbenzyl cations to form the observed C(1)-addition products. We also note that vinyldiazo ketones can be thermally cyclized to yield pyrazole derivatives, which can react
Development of a Povarov Reaction/Carbene Generation Sequence for Alkenyldiazocarbonyl Compounds
作者:Appaso Mahadev Jadhav、Vinayak Vishnu Pagar、Rai-Shung Liu
DOI:10.1002/anie.201205692
日期:2012.11.19
Rings aplenty: A HOTf‐catalyzed (Tf=trifluoromethanesulfonyl) Povarovreaction of alkenyldiazo species has been developed and delivers diazo‐containing cycloadducts stereoselectively (see scheme). The resulting cycloadducts provide access to six‐ and seven‐membered azacycles through the generation of metal carbenes as well as the functionalization of diazo group.
Gold-catalyzed α-furanylations of quinoline N-oxides with alkenyldiazo carbonyl species
作者:Vinayak Vishnu Pagar、Rai-Shung Liu
DOI:10.1039/c5ob00696a
日期:——
Gold-catalyzed α-furanylations of 8-alkylquinoline N-oxides have been achieved using alkenyldiazo carbonyl species as nucleophiles. The reactions are applicable to a reasonable range of alkenyldiazo species and 8-alkylquinoline N-oxides. The reaction mechanism is postulated to involve an initial nucleophilic addition of diazocarbonyl species at 8-alkylquinoline N-oxides, followed by diazo decomposition.
Reactivity of Stabilized Vinyldiazo Compounds toward Alkenyl- and Alkynylsilanes under Gold Catalysis: Regio- and Stereoselective Synthesis of Skipped Dienes and Enynes
作者:Olaya Bernardo、Kota Yamamoto、Israel Fernández、Luis A. López
DOI:10.1021/acs.orglett.1c01381
日期:2021.6.4
the gold-catalyzed reaction of vinyldiazo compounds and alkenylsilanes to produce skipped dienes, which are common structural motifs in an array of bioactive compounds. This carbon–carbon bond-forming transformation proceeds with complete regio- and stereoselectivity with the silyl group serving as a regio- and stereocontrolling element. Likewise, the use of alkynylsilanes as reaction partners yielded
Gold(I)-Catalyzed Reactions between <i>N</i>-(<i>o</i>-Alkynylphenyl)imines and Vinyldiazo Ketones to Form 3-(Furan-2-ylmethyl)-1<i>H</i>-indoles via Postulated Azallyl Gold and Allylic Cation Intermediates
作者:Antony Sekar Kulandai Raj、Akshay Subhash Narode、Rai-Shung Liu
DOI:10.1021/acs.orglett.1c00038
日期:2021.2.19
This work describes gold-catalyzed additions of vinyldiazo ketones to N-(o-alkynylphenyl)imines to yield 3-(furan-2-ylmethyl)-1H-indoles involving skeletal rearrangement; these new catalyticreactions are applicable to a wide range of substrates. We postulate a new mechanism involving an initial addition of diazo ketones to azomethine ylide intermediates to yield gold-containing N-alkylated indole