A Bifunctional Ligand Enables Gold-Catalyzed Hydroarylation of Terminal Alkynes under Soft Reaction Conditions
摘要:
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.
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 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.
Iodine-Mediated, Microwave-Assisted Synthesis of 1-Arylnaphthofurans via Cyclization of 1-(1′-Arylvinyl)-2-naphthols
A metal-free, one-pot, iodine-mediated, microwave-assisted cyclization of 1-(1-arylvinyl)-2-naphthols (ortho-vinylnaphthols) into 1-arylnaphthofurans is developed. The 1-arylnaphthofurans are isolated in good to excellent yields (65-90%) using two equivalents of iodine in acetonitrile. The reactions proceed via the formation of 1-(2-iodo-1-phenylvinyl)naphthalen-2-ols as intermediates. Overall, the protocol is convenient as the reactions occur smoothly without the requirement of a transition-metal catalyst.