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。
A mild and efficient method for selective cleavage of ketals and acetals using lithium chloride in water - dimethyl sulfoxide
作者:Pijus Kumar Mandal、Pinak Dutta、Subhas Chandra Roy
DOI:10.1016/s0040-4039(97)01689-4
日期:1997.10
A mild and efficient neutral aqueous method for selective cleavage of acetals and ketals to the corresponding carbonyl compounds has been established by using LiCl in H2O-DMSO at elevated temperature. While aryl and α,β-unsaturated ketals and acetals underwent smooth cleavage, diaryl, non-aryl and isolated ketals and acetals remained unaffected under the reaction conditions.
作者:P Saravanan、M Chandrasekhar、R Vijaya Anand、Vinod K Singh
DOI:10.1016/s0040-4039(98)00366-9
日期:1998.5
A variety of acetonides and acetals were efficiently cleaved using CuCl2.2H2O in MeCN. The method was effectively used in synthesis of chiral diols which are important in asymmetric synthesis.
The synthetic utility of potassium dichromate in the presence of Lewis acids under solid phase conditions is described. This reagent efficiently oxidizes alcohols, acyloins, oximes and semicarbazones to their corresponding carbonyl compounds, while trimethylsilyl and tetrahydropyranylethers, ethylene acetals and ketals undergo oxidative deprotection to produce carbonyl compounds efficiently.
[EN] PROCESS FOR PREPARATION OF ROFLUMILAST<br/>[FR] PROCÉDÉ DE PRÉPARATION DE ROFLUMILAST
申请人:SCINOPHARM CHANGSHU PHARMACEUTICAL LTD
公开号:WO2013131484A1
公开(公告)日:2013-09-12
The present invention provides novel processes for the preparation of N-substituted benzamides having the formula (VIc). In some embodiments, the invention provides a process for preparation of roflumilast and other pharmaceutically active species. Novel compounds, including intermediates for the synthesis of roflumilast, are also provided.