The reductive cyclization of epoxygeranyl acetate (1) was investigated using a catalytic amount of Cp2TiCl with various additives. The newly developed Cp2TiCl-Mn-lutidine.HCl-BEt3 system was found to be as effective as the reported stoichiometric system to afford the cyclized dehydro products 4 and 5 with 72% selectivity. (C) 2004 Elsevier Ltd. All rights reserved.
Water: The Ideal Hydrogen-Atom Source in Free-Radical Chemistry Mediated by TiIII and Other Single-Electron-Transfer Metals?
作者:Juan M. Cuerva、Araceli G. Campaña、José Justicia、Antonio Rosales、Juan L. Oller-López、Rafael Robles、Diego J. Cárdenas、Elena Buñuel、J. Enrique Oltra