2,6-Dicarboxypyridinium Chlorochromate. An Efficient and Selective Reagent for the Mild Deprotection of Acetals, Thioacetals, and 1,1-Diacetates to Carbonyl Compounds
chlorochromate (2,6- DCPCC ) was found to be an efficientreagent for the conversion of acetals, thioacetals, and 1,1-diacetates to their corresponding carbonyl compounds under neutral and anhydrous conditions in good to excellent yields. Selectivedeprotection of acetals or 1,1-diacetates in the presence of thioacetals at room temperature is also observed with this reagent.
N,N-Dialkyl-N′-arylhydrazines have been prepared usually in high to excellent yields via the reaction of N,N-dialkylhydrazines with arylchlorides in the presence of Pd2(dba)3, Xphos and NaO-t-Bu in dioxane at 120 °C. With ortho-substituted arylchlorides best results have been obtained by using 2-(2′,6′-dimethoxybiphenyl)dicyclohexylphosphine (ligand d) as the ligand.
CARO'S ACID SUPPORTED ON SILICA GEL. PART VI. A MILD REAGENT FOR REGENERATION OF CARBONYL COMPOUNDS FROM ACETALS, KETALS, AND 1,1-DIACETATES
作者:M. M. Lakouraj、M. Tajbakhsh、V. Khojasteh、M. H. Gholami
DOI:10.1080/10426500490494750
日期:2004.12.1
Efficient conversion of acetals, ketals, and diacetates to carbonylcompounds is described using Caro's acid supported on silica gel. The deacetalization reactions are carried out in acetonitrile at room temperature. Reaction of diacetates is performed in refluxing dichloromethane, and their parent carbonylcompounds are obtained in good-to-excellent yields.
使用负载在硅胶上的 Caro 酸描述了缩醛、缩酮和二乙酸酯向羰基化合物的有效转化。脱缩醛反应在室温下在乙腈中进行。双乙酸酯在回流二氯甲烷中反应,得到母体羰基化合物,产率从优到优。
Intermolecular Reactions of Chlorohydrine Anions: Acetalization of Carbonyl Compounds under Basic Conditions
作者:Michał Barbasiewicz、Mieczysław Ma̧kosza
DOI:10.1021/ol0613113
日期:2006.8.1
[reaction: see text] Nonenolizable aldehydes and ketones react with 2-chloroethanol and 3-chloropropanol under basic conditions (t-BuOK, DMF/THF) with formation of 2-substituted 1,3-dioxolanes and 1,3-dioxanes, respectively. Conversion of the two-step addition-alkylation process depends on the electrophilicity of the carbonyl group that governs the equilibrium of addition of chloroalkoxides. This method
Potassium Ferrate Supported on Montmorillonite K-10: A Mild and Efficient Reagent for Oxidative Deprotection of Acetals and Ketals
作者:Majid M. Heravi、Mahmood Tajbakhsh、Setareh Habibzadeh、Mitra Ghassemzadeh
DOI:10.1007/s007060170061
日期:2001.8
A variety of acetals and ketals were oxidatively deprotected to their parent compounds using potassium ferrate(VI) supported on montmorillonite K-10 under non-aqueous conditions.