atom-economic, practical strategy for the synthesis of tri/tetra-substituted furans through electrochemical [3 + 2] annulation between alkynes and β-keto compounds with ferrocene (Fc) as the catalyst. This protocol features the use of a graphite felt (GF) anode and a stainless steel (SST) cathode, mild conditions, and excellent tolerance with various alkynes and β-keto compounds. Additionally, the application
Direct access to furan and cyclopropane derivatives via palladium-catalyzed C–H activation/alkene insertion/annulation
作者:Xu Zhang、Mengfan Chang、Xuefeng Xu、Qiang Zhao
DOI:10.1039/d4cc01964d
日期:——
effective palladium-catalyzed C–H activation/alkene insertion/annulation has been reported for the synthesis of furans and cyclopropanes from cyclic 1,3-diketones or 1,3-indandione and diverse alkenes, resulting in moderate to good yields. This protocol demonstrates excellent selectivity and is well-compatible with a wide range of alkene substrates, exhibiting exceptional regioselectivities, high efficiency
A conceptually new strategy has been described for the mild, practical, and environmentally friendly preparation of naphthols and furans using a visible-light promoted photoredox neutral approach. These reactions between accessible electron-deficient bromides and commercially available alkynes could be carried out at room temperature in good-to-excellent chemical yields without any external stoichiometric oxidants.