Aliphatic and aromatic acetals are easily and efficiently converted to the corresponding nitriles by reaction with hydroxylamine hydrochloride in refluxing absolute ethanol.
脂肪族和芳香族缩醛在回流的无水乙醇中,可通过与盐酸羟胺反应,容易且高效地转化为相应的腈类化合物。
Chemoselective deprotection and deprotection with concomitant reduction of 1,3-dioxolanes, acetals and ketals using nickel boride
作者:Jitender M. Khurana、Kiran Dawra、Purnima Sharma
DOI:10.1039/c4ra15404e
日期:——
An efficient and mild methodology for the reductive deprotection of 1,3-dioxolanes, acetals and ketals to the corresponding aldehydes/ketones and also deprotection with concomitant reduction to the corresponding alcohols has been achieved in quantitative yields using nickel boride generated in situ from nickel chloride and sodium borohydride in methanol. The reactions are chemoselective as halo, alkoxy
Structurally different carbonyl compounds were converted into their corresponding cyclic acetals using polyaniline-sulfate salt as catalyst in dry toluene in excellent yield. In turn, useful deacetalization in aqueous medium was demonstrated. Chemoselective protection of carbonyl compounds was also demonstrated. The advantages of the polyaniline-sulfate salt are ease of preparation and handling, stability, reusability and activity.
Stepwise Reduction of Acetals to the Corresponding Hydrocarbons. A Mild and Effective Transformation via Carbinyl Bromides
作者:Takeshi Oriyama、Yuichi Ichimura、Gen Koga
DOI:10.1246/bcsj.64.2581
日期:1991.8
Stepwise reduction of two alkoxyl groups in acetal was effected by the action of triethylsilane along with acetyl bromide and SnBr2 and then of tributyltin hydride (or lithium aluminium hydride) providing methyl or methylene compounds in good yields under very mild conditions.
The invention relates to a compound of formula (I)
wherein A, R
1
-R
6
are as defined in the description and in the claims. The compound of formula (I) can be used as a medicament.