Iron in the Service of Chromium: The <i>ortho</i>-Benzannulation of <i>trans</i>,<i>trans</i>-Dienyl Fischer Carbene Complexes
作者:Yiqian Lian、William D. Wulff
DOI:10.1021/ja0540268
日期:2005.12.1
from dienyl chromium carbene complexes is a known process (ortho-benzannulation) that only occurs with certain cis,trans-dienyl complexes. Control experiments show that trans,trans-dienyl chromium carbene complexes do not undergo conversion to 2-alkoxyphenols in the absence of an iron source. The process most likely occurs either via coordination of the dienyl unit in the chromium carbene complex to
Iodine-Catalyzed Iso-Nazarov Cyclization of Conjugated Dienals for the Synthesis of 2-Cyclopentenones
作者:Lucía A. Marsili、Jorgelina L. Pergomet、Vincent Gandon、Martín J. Riveira
DOI:10.1021/acs.orglett.8b03229
日期:2018.11.16
Molecular iodine was identified as an efficient catalyst for the cycloisomerization of conjugated dienals to substituted 2-cyclopentenones. DFT calculations suggested an unexpected concerted character for this cyclization.
We describe the results of manganese(III) acetate based regioselective oxidation of various α,β-unsaturated cyclopentanones leading to α′-acetoxy α,β-unsaturated cyclopentanones in good yields. Products due to monophenyl and diphenyl substituted dimerization have been identified as byproducts of the reaction.
Acid-Promoted Iso-Nazarov Cyclization of Conjugated <i>trans</i>-Dienones and Dienals for the Synthesis of 2-Cyclopentenones
作者:Agustina La-Venia、Lucas Passaglia、Lucía Gurgone、Vincent Gandon、Martín J. Riveira
DOI:10.1021/acs.joc.2c01783
日期:2022.10.21
The acid-promoted cyclization of all-trans linearly conjugated dienones and dienals constitutes a synthetic strategy for the construction of 2-cyclopentenones.