Allylic gallium reagents, prepared from gallium trichloride and the corresponding allylic Grignard reagents, allylated carbonyl compounds in good yields in an aqueous medium as well as in organic solvent.
Highly sulphated cellulose: a versatile, reusable and selective desilylating agent for deprotection of alcoholic TBDMS ethers
作者:Soma Shekar Dachavaram、Narsimha R. Penthala、Julie L. Calahan、Eric J. Munson、Peter A. Crooks
DOI:10.1039/c8ob01438h
日期:——
A mild, efficient and rapid protocol was developed for the deprotection of alcoholic TBDMS ethersusing a recyclable, eco-friendly highly sulphated cellulose sulphate acid catalyst in methanol. This acid catalyst selectively cleaves alcoholic TBDMS ethers in bis-TBDMS ethers containing both alcoholic and phenolic TBDMS ether moieties.
Highly Efficient Allylation of Aldehydes Promoted by Maleic Acid in Aqueous Media
作者:Gang Zhao、Gui-long Li
DOI:10.1055/s-2005-917088
日期:——
A highly efficient promoter for allylation of aldehydes in aqueousmedia was developed. Under the promotion of maleic acid, the allylation of various aldehydes can be finished in a short period of reaction time to afford the corresponding homoallylic alcohols in high to quantitative yields.
Catalyzed by PdCl2, SnCl2 can efficiently mediate the allylation of various aldehydes with allyl chloride or bromide, but not with allyl alcohol, in fully aqueous media. The yield of the reaction is very high (90–100%), and the reaction is operationally simple, environmental benign and easy to scale up.
Barbier-Type Allylation of Aldehydes and Ketones with Metallic Lead in Aqueous Media
作者:Jing-Yao Zhou、Yu Jia、Guang-Fu Sun、Shi-Hui Wu
DOI:10.1080/00397919708006791
日期:1997.6
Abstract Homoallylic alcohols can be obtainedfromallylation of aldehydes and ketones with allyl bromide promoted by metallic lead. These reactions can be carried out smoothly in aqueous media.