41491-33-2Relevant academic research and scientific papers
New syntheses of the C,D-ring pyrromethenones of phytochrome and phycocyanin
Jacobi,DeSimone,Ghosh,Guo,Leung,Pippin
, p. 8478 - 8489 (2007/10/03)
Pyrromethenone 7, the C,D-ring segment of phytochrome (Pr, 4), has been prepared in an efficient fashion employing three new strategies. Each of these has potential advantages for the synthesis of labeled material. Our first approach is related to the Gos
Reactions of Enolates with Vinyl Selenoxides and Vinyl Selenones. One-Step Synthesis of Cyclopropylcarbonyl Compounds
Ando, Ryoichi,Sugawara, Tomoo,Shimizu, Makoto,Kuwajima, Isao
, p. 2897 - 2904 (2007/10/02)
In the reactions with enolate anions, organoselenium moieties of aryl vinyl selenoxides and selenones have exhibited two important roles, e.g., activation of C=C bonds for conjugate addition reaction and behaviors as excellent leaving groups.Owing to such characteristic fetaures, ketone enolates react with p-chlorophenyl vinyl selenoxide to afford the corresponding cyclopropyl ketones through an initial conjugate addition followed by substitution processes.On the other hand, use of vinyl selenones usually gives much better results with anionic species of active methylene compounds.Vinyl selenones bearing hydroxyl, ketone, and ester groups can also be employed equally well for this type of transformation.
