A New Route for Generation of α-λ<sup>3</sup>-Iodanyl Ketones via Ester Exchange of (<i>Z</i>)-(β-Acetoxyvinyl)-λ<sup>3</sup>-iodanes: Their Nucleophilic Substitutions with Halides and Sulfur and Phosphorus Nucleophiles
作者:Masahito Ochiai、Junichi Nishitani、Yoshio Nishi
DOI:10.1021/jo0107711
日期:2002.6.1
An efficient method for generation of alpha-lambda3-iodanyl ketones from (Z)-(2-acetoxyvinyl)(phenyl)-lambda3-iodanes was developed. The method involves ester exchange of (Z)-2-acetoxyvinyl-lambda3-iodanes with methanol in the presence of triethylamine. alpha-lambda3-Iodanyl ketones react with a variety of nucleophiles such as halides, thiols, phosphines, phosphinic acids, and phosphates, under the
Triphenylphosphine-mediated olefination of aldehydes with (Z)-(2-acetoxyalk-1-enyl)phenyl-λ3-iodanes: generation and reaction of (2-oxoalkyl)phenyl-λ3-iodanes
(Z)-(2-Acetoxyalk-1-enyl)phenyl-λ3 -iodanes, on treatment with triethylamine in methanol in the presence of triphenylphosphine, undergo Wittig olefination with aldehydes, which involves the intermediacy of α-iodanyl ketones generated by in situ protonation of monocarbonyliodoniumylides.