The Synthesis of Internal Conjugated (<i>E</i>)-Enynyldialkylboranes and Their Applications to the Syntheses of Conjugated Alkynones, Conjugated (<i>E</i>)-Enynes, and Conjugated Enynes Bearing an Unsaturated Group on the Double Bond
作者:Masayuki Hoshi、Yuzuru Masuda、Akira Arase
DOI:10.1246/bcsj.58.1683
日期:1985.6
(E)-Enynyldialkylboranes, thus obtained, gave regio- and/or stereospecifically defined corresponding conjugated alkynones by alkaline hydrogen peroxide oxidation, conjugated (E)-enynes by protonolysis with acetic acid, and conjugated enynes bearing an unsaturated group on the internal alkenyl carbon atom by bis(acetylacetonato)copper-catalyzed cross-coupling reaction with allyl bromide or 1-bromo-1-hexyne respectively
A Novel Synthesis of Internal Alkenyldialkylborane by the Reaction of 1-Halo-1-alkenyldialkylborane with Grignard Reagent
作者:Akira Arase、Masayuki Hoshi、Yuzuru Masuda
DOI:10.1246/bcsj.57.209
日期:1984.1
To synthesize internal alkenyldialkylboranes, coupling reactions were carried out by using 1-halo-l-alkenyldialkylboranes and Grignardreagents. Hydrogen peroxide oxidation and protonolysis with acetic acid of the reaction product revealed that internal (E)-alkenyldialkylborane was formed in 60–90% yield.
The Reaction of Alkenylboranes with Palladium Acetate. Stereoselective Synthesis of Olefinic Derivatives
作者:Hidetaka Yatagai
DOI:10.1246/bcsj.53.1670
日期:1980.6
The reactions of alkenylboranes with palladium acetate were investigated. Alkenyldialkylboranes, derived from terminal alkynes, underwent intramolecular migration reaction in the presence of an equimolar amount of palladium acetate and triethylamine to give (E)-olefins. On the other hand, under the same conditions as above or even in the presence of catalyticamounts of palladium acetate, alkenyldialkylboranes