Organoselenium chemistry. 4. Deprotonations with potassium diisopropylamide-lithium tert-butoxide. Alkylation of 1-(phenylseleno)alkenes and bis(phenylseleno) acetals
The addition of selenophenol to mono - and di-substituted unactivated acetylenes have been investigated. At room temperature the vinylicselenides obtained were predominantly of the Z configuration; at 120°C Z/E mixtures were produced. Vinylicselenides with the E configuration were obtained by reduction of the corresponding selenoacetylenes with lithium aluminium hydride.
The Synthesis of<i>Se</i>-Alkyl Alkaneselenoates via (1-Iodo-1-alkenyl)dialkylboranes
作者:Masayuki Hoshi、Yuzuru Masuda、Akira Arase
DOI:10.1246/bcsj.61.3764
日期:1988.10
Se-Alkyl alkaneselenoates were formed in moderate to good yields by successive reactions of (1-iodo-1-alkenyl)bis(1,2-dimethylpropyl)boranes with alkylselenomagnesium bromides and alkaline hydrogen peroxide.
Alkenyl, aryl or allylic selenides smoothly couple with Grignardreagents in the presence of Ni(II)-phosphine complexes as catalysts to afford the corresponding unsaturated compounds in good yields. The reactivity order of coupling reaction with BuMgBr catalyzed by NiCl2 [Ph2PCH2CH2CH2PPh2] was found to be PhSeMe « PhCl > PhSMe by the competitive reactions.
A Stereoselective Route to (E)-Vinylic Selenides through the Palladium-Catalyzed Cross-Coupling Reaction of Selenovinylicdialkylboranes with Alkyl Halides
作者:Yu Yang、Xian Huang
DOI:10.1080/00397919708005038
日期:1997.1
Abstract The reaction of selenoviylicdialkyboranes with alkyl halides takes place readily in the presence of Pd(PPh3)4 and sodium methoxide to afford (E)-vinylic selenides in excellent yields