Dibutyltin Oxide Catalyzed Allyl-Transfer Reaction from Tertiary Homoallylic Alcohols to Aldehydes
作者:Akira Yanagisawa、Takahiro Aoki、Takayoshi Arai
DOI:10.1055/s-2006-948198
日期:2006.8
A catalytic allyl-transfer reaction from tertiary homoallylicalcohols to aldehydes was achieved using dibutyltin oxide as a catalyst in toluene under reflux conditions. Various secondary homoallylicalcohols were prepared in high yield (up to 99%). When β-alkylated tertiary homoallylicalcohols were used, branched products were exclusively obtained.
Irradiation of aromatic carbonylcompounds and allyl-, 2-methyl-2-propenyl-, or 3-methyl-2-butenyltrimethylstannanes in acetonitrile afforded δ,γ-unsaturated alcohols as major product. A photoinduced electron transfer mechanism is proposed for the allylations.
The Catalyzed Desulfinylative Allylation of Carbonyl Compounds with Alk-2-enesulfonyl Chlorides and Silyl Alk-2-enesulfinates
作者:Chandra M. R. Volla、Dean Marković、Sylvain Laclef、Pierre Vogel
DOI:10.1002/chem.201000705
日期:——
Coupling up with sulfonyl chlorides: An ene reaction of alkenes with SO2⋅BCl3 permits the one‐pot conversion of simple alkenes into β,γ‐unsaturated sulfonyl chlorides or sulfinic silyl esters. These compounds can then be used as nucleophilic allylating agents with aldehydes and ketones to generate the corresponding homoallylic alcohols (see scheme) with good chemo‐ and diastereoselectivity in the presence
The electroreduction of a catalytic amount of ZnBr2 in acetonitrile provided a active Zn*, able to catalyze the reductive coupling of allyl bromides and chlorides with carbonyl compounds with high regioselectivity. Substituted α-methylene γ-lactones were obtained from functionalized allyl derivatives.