Cyclizations and rearrangements of propynylsulfamides: x-ray crystal structure of 2,3-dihydro-2-acetyl-3,3-dimethyl-4-[(1E)-4-methyl-1,3-pentadienyl]-1,2,5-thiadiazole 1,1-dioxide
Metal-free 5-exo-dig cyclization of propargyl urea using TBAF
摘要:
We present the first results of the intramolecular cyclization of propargyl ureas catalyzed by TBAF. Depending on the substituents close to the triple bond, imidazolone or methylene-imidazolidinone was obtained. The dual activation of the triple bond by interaction with TBAF via the cation-pi is thought to be responsible. (C) 2014 Elsevier Ltd. All rights reserved.