Palladium(II)-Catalyzed Synthesis of Functionalized Indenes from o-Alkynylbenzylidene Ketones
摘要:
An efficient method for the synthesis of functionalized indenes from o-alkynylbenzylidene ketones under palladium(II) catalysis was developed. The reaction is initiated by trans-nucleopalladation of alkynes, followed by conjugate addition and quenched by protonolysis of the carbon palladium bond. With acetate and halide ions as nucleophiles, 3-acetoxy- and 3-halogen-substituted indenes could be obtained in high yields.
Cascade One-Pot Synthesis of Indanone-Fused Cyclopentanes from the Reaction of Donor-Acceptor Cyclopropanes and Enynals <i>via</i>
a Sequential Hydrolysis/Knoevenagel Condensation/[3+2] Cycloaddition
作者:Jiantao Zhang、Huanfeng Jiang、Shifa Zhu
DOI:10.1002/adsc.201700345
日期:2017.9.4
to construct indanone‐fused cyclopentanes via a sequential hydrolysis/Knoevenagelcondensation/[3+2] cycloaddition is reported. The desired indanone‐fused cyclopentanes were obtained in good yields. This method features mild reaction conditions and broad substrate scope, which render it very appealing to chemists for the synthesis of complex molecules containing an indanone‐fused cyclopentane moiety
An efficient route to highly strained cyclobutenes: indium-catalyzed reactions of enynals with alkynes
作者:Renxiao Liang、Huanfeng Jiang、Shifa Zhu
DOI:10.1039/c4cc08506j
日期:——
synthesize the highly strained cyclobutene was developed. The reaction was believed to proceed through a formal indium-catalyzed [2+2] cycloaddition between electron-deficient enynals and various alkynes.
A one‐pot tandemprocess involving hydrolysis, Knoevenagel condensation, Michael addition, and Conia‐ene (HKMC) reactions has been developed for the rapid synthesis of indanone‐fused 2‐methylenetetrahydrofurans from the reaction of enynals and propynols. In this process, two rings and four bonds are generated with 100 % atom‐economy and high step‐efficiency. The resulting tetrahydrofurans were readily
Phosphazene-Base-Catalyzed Tandem Addition-Cyclization Reaction of o-Alkynylbenzaldehyde with Oxygen and Nitrogen Nucleophiles
作者:Masahiro Terada、Chikashi Kanazawa、Akira Ito
DOI:10.1055/s-0028-1087909
日期:2009.3
The tandem addition-cyclization reaction between o-alkynylbenzaldehyde and nucleophile catalyzed by P4- t Bu, a phosphazene base, is demonstrated. The nucleophilic cyclization is efficiently triggered not only by alcohols, including sterically demanding ones, but also by nitrogennucleophiles, such as amide and pyrrole, under the influence of a catalytic amount of P4- t Bu. The method enables efficient
证明了邻炔基苯甲醛和亲核试剂在磷腈碱 P4-t Bu 催化下的串联加成环化反应。在催化量的 P4-t Bu 的影响下,亲核环化不仅由醇(包括空间要求高的醇)有效触发,而且由含氮亲核试剂(如酰胺和吡咯)有效触发。该方法能够在温和条件下有效获取异苯并呋喃衍生物。
Synthesis of Indole-Substituted Indanones via Palladium(II)-Catalyzed Tandem Reaction of<i>ortho</i>-Electron-Deficient Alkynyl-Substituted Aryl Aldehydes with Indoles
作者:Jianbo Zhang、Xiuling Han、Xiyan Lu
DOI:10.1021/acs.orglett.6b01240
日期:2016.6.17
A Pd(OAc)2-catalyzed cyclization reaction of ortho-electron-deficient alkynyl-substituted arylaldehydes with indoles was accomplished, providing an efficient and economical way to synthesize indole-substituted indanones. The electron-withdrawing group attached to the alkyne and the nucleophilic indole play important roles in the formation of the indanone ring.