We developed a facile and practical synthesis of various alkynyl Z-ketimines, which can be used as a synthetic equivalent of alkyl ketimines. The obtained alkynyl Z-ketimines could be successfully applied in enantioselective Mannich reaction and conjugate addition catalyzed by a chiral amine with an acid functionality.
β-Halovinyl ketones: Synthesis from acetylenic ketones
作者:Mikio Taniguchi、Shozo Kobayashi、Masako Nakagawa、Tohru Hino、Yoshito Kishi
DOI:10.1016/s0040-4039(00)85059-5
日期:1986.1
of terminal acetylenicketones with NaI or LiBr gave almost exclusively E-β-iodo- or E-β-bromovinyl ketones in trifluoroacetic acid, while Z-β-iodo- or Z-β-bromovinyl ketones were the major products in acetic acid. Trimethylsilyl iodide and bromide reacted smoothly with acetylenicketones at −78°C to give TMS-allenolates which were readily converted to β-iodo- and β-bromovinyl ketones, respectively
Stereoselective Mannichreactions of aldehydes with ketimines provide chiral β-amino aldehydes that bear an α-tert-amine moiety. However, the structural variation of the ketimines is limited due to the formation of inseparable E/Z isomers, low reactivity, and other synthetic difficulties. In this study, a highly diastereodivergent synthesis of hitherto difficult-to-access β-amino aldehydes that bear
NOVEL DEORDORISING COMPOSITIONS AND DEODORISING PRODUCTS CONTAINING SAME
申请人:Casazza André
公开号:US20120201778A1
公开(公告)日:2012-08-09
The invention relates to novel deodorant compositions containing at least one compound of the family of acetylenic ketones and the deodorant products containing them. A particularly preferred composition according to the invention comprises at least one compound of the family of the α-acetylenic ketones and a mixture of aldehydes chosen from two different families.
作者:Kjetil Andreas Netland、Lise-Lotte Gundersen、Frode Rise
DOI:10.1080/00397910008087222
日期:2000.4
Dialkylcyclopropenones are formed in high yields when alkynes are treated with chloroform-butyllithium in THF at - 78 degrees C followed by acidic hydrolysis of the dichlorocyclopropene intermediates at low temperatures.