Ketyl−Allene Cyclizations Promoted by Samarium(II) Iodide
作者:Gary A. Molander、Elizabeth Pollina Cormier
DOI:10.1021/jo047887s
日期:2005.4.1
Samarium(II) iodide has proven to be an effective reagent for intramolecular reductive coupling reactions. Previous investigations of intramolecular ketyl−olefin coupling reactions provided carbocycles in excellent yield and good diastereoselectivity. This method has been extended to ketyl cyclizations with allenes. Substrates leading to both carbocycles and heterocycles in a selective manner are explored
cis-Stereoselective nickel-catalyzed cyclization/alkylation and arylation reactions of allenyl-aldehydes and -ketones with organozinc reagentsElectronic supplementary information (ESI) available: typical procedures, NMR-data, and X-ray data. See http://www.rsc.org/suppdata/cc/b2/b207620a/
作者:Suk-Ku Kang、Seok-Keun Yoon
DOI:10.1039/b207620a
日期:2002.11.4
Highly stereoselective alkylative and arylative cyclization reactions of allenyl-aldehydes and -ketones with organozincreagents occur efficiently in the presence of catalytic Ni(COD)2 to afford cis-fused homoallylic cyclopentanols.
α,β-Unsaturated and cyclopropyl acyl radicals, and their ketene alkyl radical equivalents. Ring synthesis and tandem cyclisation reactions
作者:Christopher J. Hayes、Nicola M. A. Herbert、Nicole M. Harrington-Frost、Gerald Pattenden
DOI:10.1039/b413815p
日期:——
25a on treatment with Bu(3)SnH-AIBN. Furthermore, in the presence of methanol the only product from this reaction was the bis(methyl ester) dimer 25b, thereby lending further credence to the involvement of ketene alkyl radical intermediates in these reactions, and in the aforementioned reactions involving 2,6- and 2,7-diene selenyl esters. Treatment of the cyclopropane selenyl esters and , containing
Construction of Cyclic Nitrones Enabled by Photodriven and Gold-Catalyzed 1,3-Azaprotio Transfer of Allenyloximes
作者:Zhenjie Qi、Shaozhong Wang
DOI:10.1021/acs.joc.3c01937
日期:2023.11.3
protocol was developed to construct five- to seven-membered cyclic nitrones through the gold-catalyzed 1,3-azaprotio transfer of allenyloximes under photoirradiation. The photoisomerization of oximes was suggested to convert the inert stereoisomer to a reactive one. This photodriven and gold-catalyzed ring formation could be further extended to the thermodynamically stable aryl ketoximes with an E-configuration