A highly atom-efficient synthetic protocol for hydroarylation of terminal-aryl alkynes and styrene through the regioselective CC bond formation via the electrophilic addition of naphthols and substituted phenols has been developed using alumina-sulfuric acid as a heterogeneous supported solid acid catalyst. This methodology shows excellent regioselectivity and affords the desired product in good to
hydroarylation with naphthols and phenols in the presence of 10 mol% of gallium(III) chloride in refluxing toluene to afford the corresponding 2-vinylnaphthols and -phenols in good yields with high regioselectivity. Similarly, styrenes undergo hydroarylation with naphthols and phenols to provide substituted naphthols and phenols. arylations - arylacetylenes - gallium(III) chloride - phenols - addition reactions
transition metal-catalyzed reactions. Herein we have developed nickel-catalyzed synthesis of 3-aryl benzofurans from ortho-alkenyl phenols via intramolecular dehydrogenative coupling. Notably, simple O2 gas served as an oxidant, without using any sacrificial hydrogen acceptor. The strategy enabled the synthesis of 3-aryl benzofurans in good to excellent yields.
最近的研究集中在过渡金属催化的反应上。在此,我们开发了通过分子内脱氢偶联从邻-烯基酚中镍催化合成 3-芳基苯并呋喃。值得注意的是,简单的 O 2气体用作氧化剂,没有使用任何牺牲的氢受体。该策略能够以良好至优异的产率合成 3-芳基苯并呋喃。
A Bifunctional Ligand Enables Gold-Catalyzed Hydroarylation of Terminal Alkynes under Soft Reaction Conditions
An efficient gold-catalyzed hydroarylation of alkynes under soft reaction conditions is developed by utilizing a bifunctional ligand. This transformation features a broad substrate scope and thus exhibits moderate to excellent efficiency.
A Simple and Efficient Synthesis of 2,3-Diarylnaphthofurans Using Sequential Hydroarylation/Heck Oxyarylation
作者:V. Kameshwara Rao、Ganesh M. Shelke、Rakesh Tiwari、Keykavous Parang、Anil Kumar
DOI:10.1021/ol400738r
日期:2013.5.3
An efficient and simple strategy has been developed for the synthesis of 2,3-diarylnaphthofurans using sequential hydroarylation of naphthols and alkynes in the presence of In(OTf)(3) under microwave irradiation followed by one-pot Heck-oxyarylation of generated 1-substituted-alpha-hydroxy styrenes.