Mechanistic studies of the phosphine-catalyzed homodimerization of ketoketenes
作者:Pei-Hsun Wei、Ahmad A. Ibrahim、Mukulesh Mondal、Divya Nalla、Gero D. Harzmann、Frank A. Tedeschi、Kraig A. Wheeler、Nessan J. Kerrigan
DOI:10.1016/j.tetlet.2010.10.026
日期:2010.12
ketoketenes has been explored and compared with that of the previously reported trialkylphosphite-mediated reactions. NMR studies of the PBu3-catalyzed reaction implicated the involvement of tetravalent phosphonium intermediates. Phosphonium intermediates in the catalytic cycle were trapped through reaction with trimethylsilyl chloride and 4-chlorobenzaldehyde, and the resulting products were characterized
作者:Ahmad A. Ibrahim、Gero D. Harzmann、Nessan J. Kerrigan
DOI:10.1021/jo8024785
日期:2009.2.20
A general method for the catalytic dimerization of ketoketenes is described. Tri-n-butylphosphine was found to be the optimal organocatalyst for the racemic reaction. When lithium iodide was used as an additive, the reaction was rendered selective for dimer formation (dimer/trimer >= 16:1). Ring-opening reactions of the ketoketene dimers as well as preliminary studies toward the development of an asymmetric variant are also reported.
Phosphine-catalyzed stereoselective dimerizations of ketenes
作者:Ahmad A. Ibrahim、Pei-Hsun Wei、Gero D. Harzmann、Divya Nalla、Mukulesh Mondal、Kraig A. Wheeler、Nessan J. Kerrigan
DOI:10.1016/j.tet.2020.131838
日期:2021.1
Full details of optimisation studies of the phosphine-catalyzed ketene homodimerization reaction and the detailed development of an asymmetric variant are discussed. Studies towards the development of a phosphine-catalyzed ketene heterodimerization reaction are revealed. A discussion of possible reaction mechanisms for the dimerization reactions, supported by spectroscopic analysis of intermediates