Treatment of gamma-unsaturated oxime esters with cupric acetate or ferric chloride in acetic acid / t-butanol or in t-butanol alone leads to the formation of vinyl- or chloroalkyl- substituted Delta(1)-pyrrolines in moderate to good yield.
Low-valent zirconocene-mediated cyclization of γ,δ-unsaturated oximes
gamma,delta-Unsaturated O-methyl oximes were cyclized to dihydropyrrole by the treatment of (1-butene)ZrCp2 3 prepared by Negishi's procedure (reaction with Cp2ZrCl2 and two equivalents of n-BuLi). In this cyclization, the geometry of oximes was affected and syn-oximes were cyclized efficiently. However, it was found that the anti-oxime is not suitable for the cyclization. (C) 2010 Elsevier Ltd. All rights reserved.