Synthesis of Functionalized [3], [4], [5] and [6]Dendralenes through Palladium‐Catalyzed Cross‐Couplings of Substituted Allenoates
作者:Daniel J. Lippincott、Roscoe T. H. Linstadt、Michael R. Maser、Bruce H. Lipshutz
DOI:10.1002/anie.201609636
日期:2017.1.16
A mild method for the synthesis of highly functionalized [3]–[6]dendralenes is reported, representing a general strategy to diversely substituted higher homologues of the dendralenes. The methodology utilizes allenoates bearing various substitution patterns, along with a wide range of boron and alkenyl nucleophiles that couple under palladium catalysis leading to sp‐, sp2‐, and sp3‐substituted arrays
Transfer C–H borylation is an isodesmic approach to the borylation reaction using B–C-containing molecules as boron sources. In this work, we report that 2-mercaptothiazole and other analogues are active for the metal-free borylation of heterocycles and terminalalkynes. Alkynes are challenging substrates to C–H borylate because they undergo side reactions with most borylating agents. The ability of
Copper-Catalyzed Alkynylation of Benzylic C–H Bonds with Alkynylboronic Esters
作者:Søren Kramer、Mikkel B. Buendia、Jan-Georges J. Balin、Mette E. Andersen、Zhong Lian
DOI:10.1055/s-0040-1720474
日期:2022.1
method for copper-catalyzed benzylic C–Halkynylation that uses alkynylboronic esters as nucleophilic coupling partners. The catalytic system is readily available and the reaction takes place under mild conditions. Different substrates for the C–H functionalization, as well as various alkynylboronic ester nucleophiles, were evaluated. Finally, three examples of enantioselective C–Halkynylations are presented
General One-Pot Synthesis of Alkynyliodonium Salts and Alkynyl Benziodoxolones from Aryl Iodides
作者:Marinus J. Bouma、Berit Olofsson
DOI:10.1002/chem.201202977
日期:2012.11.5
of a triple bond! The first one‐pot synthesis of alkynyl(aryl)iodonium salts directly from aryl iodides has been developed. The reaction is fast and high yielding, and can be extended to the synthesis of alkynyl benziodoxolones (see scheme). The developed methodology is expected to greatly facilitate the access to this interesting class of hypervalent iodine reagents, and many new application areas
the reaction is determined depending on the type of the substituent at the aromatic ring in triazine PN5P pincer ligands. Thus, our catalytic approach has been successfully applied to obtain both hydroboration and dehydrogenative coupling products. Finally, this versatile protocol implies the use of commercially available pinacolborane as a simultaneous substrate and (pre)catalyst’s activator. Moreover
在此,我们描述了由钴(预)催化剂催化的甲硅烷基乙炔与硼氢化物的功能化。反应方向取决于三嗪 PN 5 P 钳形配体中芳环上取代基的类型。因此,我们的催化方法已成功应用于获得硼氢化和脱氢偶联产物。最后,这种多功能协议意味着使用市售的频哪醇硼烷作为同时底物和(预)催化剂的活化剂。此外,所描述的程序导致了一组有趣的化合物,具有许多潜在的工业和合成应用。