Low-valent zirconocene-mediated cyclization of γ,δ-unsaturated oximes
摘要:
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.
Synthesis of Pyrrole Derivatives by the Heck-Type Cyclization of γ,δ-Unsaturated Ketone<i>O</i>-Pentafluorobenzoyloximes
作者:Hironori Tsutsui、Koichi Narasaka
DOI:10.1246/cl.1999.45
日期:1999.1
Substituted pyrroles are synthesized from γ,δ-unsaturated ketone O-pentafluorobenzoyloximes by the intramolecular Heck-type amination of the olefinic moiety catalyzed by Pd(PPh3)4.