Zeise’s dimer-catalyzed regioselective hydration of homopropargyl tertiary ether
摘要:
The regioselective hydroalkoxylation of homopropargyl tertiary ether catalyzed by Zeise's dimer was realized. The desired products were obtained in 61-95% yield with good regioselectivity. This methodology represents a valuable alternative to the aldol reaction or the oxa-Michael reaction to form prochiral tertiary beta-hydroxy ketones. (C) 2012 Elsevier Ltd. All rights reserved.
Electrochemically Enabled Carbohydroxylation of Alkenes with H2O and Organotrifluoroborates
摘要:
Unprecedented hydroxy-alkynylation and -alkenylation reactions of arylalkenes have been developed through electrochemically enabled addition of an organotrifluoroborate reagent and H2O across the double bond of the alkene. The use of electrochemistry to promote these oxidative alkene 1,2-difunctionalization reactions not only obviates the need for transition-metal catalysts and oxidizing reagents but also ensures high regio- and chemoselectivity to afford homopropargylic or homoallylic alcohols. The possibility of extending the electro-chemical alkene difunctionalization strategy to other alkene carbo-heterofunctionalization reactions has been demonstrated.
Palladium-Catalyzed Allylation of Aryl Halides with Homoallyl Alcohols Bearing a Trisubstituted Double Bond: Application to Chirality Transfer from Hydroxylated Carbon to Benzylic One
A facileroute to homoallyl alcohols bearing a trisubstituted double bond has been devised. The palladium-catalyzed reactions of aryl halides with the alcohols thus synthesized result in regiospecific allyl transfer from the alcohols to aryl halides via retro-allylation, providing allylarenes having two substituents at the 1 and 2 positions of the allyl moiety. Optically active homoallyl alcohols transfer