화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.129, No.49, 15102-15102, 2007
Direct ortho cupration: A new route to regioselectively functionalized aromatics
We have developed a direct regio- and chemoselective method for generating functionalized aromatic cuprate compounds through deprotonative directed ortho cupration using TMP(tetramethylpiperidino)-cuprates (R(TMP)Cu(CN)Li-2; R = alkyl, phenyl, or TMP) that are prepared by mixing of CuCN, RLi, and lithium tetramethylpiperidide (LTMP) in THE Deprotonative cupration of various functionalized benzenes with TMP-cuprate proved effective for the direct generation of o -functionalized copper aromatic and heteroaromatic derivatives, particularly those with electrophilic functional groups, such as cyano, amide, and halogens. Direct cupration, followed by electrophilic trapping, provided a convenient preparative method for 1,2- or 1,2,3-multisubstituted aromatic compounds. The functionalized aromatic cuprate intermediates were also found to undergo oxidation reactions very efficiently and with high regio- and chemoselectivity to afford functionalized phenol, ligand(hetero)-coupling, or homocoupling products by appropriately changing the oxidants and cuprates.