A novel samarium(II)-mediated tandem spirocyclization onto an aromatic ring
摘要:
We report a samarium(II)-mediated tandem spirocyclization reaction to provide dispiro[4.2.4.2]tetradecadiene and dispiro[4.2.5.2]pentadecadiene skeletons. The reaction was achieved by intramolecular addition of a ketyl radical onto an aromatic ring bearing an electrophilic moiety followed by reductive capture of the spirohexadienyl radical intermediate with SmI2 in the presence of HMPA. (C) 2011 Elsevier Ltd. All rights reserved.