Addition of heterocycles to electron deficient olefins and alkynes catalyzed by gold(III)
作者:Zigang Li、Zhangjie Shi、Chuan He
DOI:10.1016/j.jorganchem.2005.03.009
日期:2005.11
A gold(III)-catalyzed hydroarylation of different olefins is reported here. AuCl3 works as an excellent catalyst to mediate reactions between various heterocycles and electron deficient olefins and alkynes under mild conditions. This gold(III)-based method tolerates different functional groups such as aldehyde, carboxylic acid, nitrile, and is highly efficient. We have shown that some of these reactions
of hydroxy enynes for the synthesis of bicyclo[4.3.0]non-1(9)-en-2-ones is disclosed, which can be rationalised through a cascade reaction of a dissociative Meyer–Schuster rearrangement to allenyl vanadates, followed by a thermal intramolecularDiels–Alder (IMDA) reaction and hydrolytic regeneration of the catalyst.
A Simple Synthesis of Densely Substituted Benzofurans by Domino Reaction of 2-Hydroxybenzyl Alcohols with 2-Substituted Furans
作者:Anton S. Makarov、Anna E. Kekhvaeva、Petrakis N. Chalikidi、Vladimir T. Abaev、Igor V. Trushkov、Maxim G. Uchuskin
DOI:10.1055/s-0039-1690000
日期:2019.10
Brönsted acid-catalyzed cascade synthesis of densely substituted benzofurans from easily available salicyl alcohols and biomass-derived furans has been developed. The disclosed sequence includes the intermediate formation of 2-(2-hydroxybenzyl)furans that quickly rearrange into functionalized benzofurans. The established protocol was applied for the total synthesis of sugikurojinol B. The Brönsted