been developed for the synthesis of 2‐aroylindoles (3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j) in good yields by the reaction of 2‐aminoketones (1a, 1b, 1c) with phenacyl bromides (2a, 2b, 2c, 2d). The reaction success varied with different bases and solvents in both conventional and microwave methods. But finally, it was established that piperidine in DMF was an effectivemedium to carry out the reaction
Cu(OTf)<sub>2</sub>-Catalyzed Synthesis of 2,3-Disubstituted Indoles and 2,4,5-Trisubstituted Pyrroles from α-Diazoketones
作者:B. V. Subba Reddy、M. Ramana Reddy、Y. Gopal Rao、J. S. Yadav、B. Sridhar
DOI:10.1021/ol303206w
日期:2013.2.1
A novel method has been devised for the synthesis of 2,4,5-trisubstituted pyrrole derivatives through the coupling of alpha-diazoketones with beta-enaminoketones and esters using 10 mol % of Cu(OTf)(2). A wide range of 2,3-disubstituted indole derivatives were also prepared from alpha-diazoketones and 2-aminoaryl or alkyl ketones. The synthetic versatility of this approach has been exemplified In the formal synthesis of homofascaplysin C.