Bismuth triflate-catalyzed condensation of indoles with acetone
作者:Ganesh M. Shelke、V. Kameshwara Rao、Rakesh K. Tiwari、Bhupender S. Chhikara、Keykavous Parang、Anil Kumar
DOI:10.1039/c3ra44693j
日期:——
Reaction of different substituted indoles with acetone was investigated using Bi(OTf)3 as a catalyst. An efficient protocol was developed for the synthesis of spiro indoles, 1-methyl-cyclopenta[b]indole and bis(1-methyl-1H-indolyl)propanes via the reaction of indole with acetone in the presence of Bi(OTf)3. The reaction conditions were benign, required shorter reaction time, and gave good yields.
available stable radical cation triarylaminium salt can be used as an efficient initiator for Friedel–Craftsreaction of indoles with enamides to regioselectively construct complex indole derivatives and for double Friedel–Craftsreaction of indoles with vinyl ethers to offer 3,3′-Bis(indolyl)alkane derivatives. The ready availability of the starting materials and the usefulness of the products make this