Novel and Highly Efficient Protection of Aliphatic Alcohols and Phenols with Hexamethyldisilazane in the Presence of La(NO3)3·6 H2O
摘要:
Aliphatic alcohols and phenols are protected with hexamethyldisilazane in the presence of lanthanum nitrate hexahydrate (La(NO3)(3)center dot 6H(2)O) in excellent yields at room temperature.
A New and Efficient Method for the Protection of Alcohols and Phenols by Using Hexamethyldisilazane in the Presence of Anhydrous Ferric Chloride under Mild Reaction Conditions
作者:Batool Akhlaghinia
DOI:10.1080/10426500601047487
日期:2007.4.1
Alcohols and phenols are protected with hexamethyldisilazane in the presence of anhydrousferricchloride in good to excellent yields in acetonitrile. This method is highly selective for the conversion of primary alcohols in the presence of secondary and tertiary alcohols and also for conversion phenols.
Efficient and practical protocol for silylation of hydroxyl groups using reusable lithium perchlorate dispread in silica gel under neutral condition
作者:Najmedin Azizi、Rozbeh Yousefi、Mohammad R. Saidi
DOI:10.1016/j.jorganchem.2005.11.005
日期:2006.2
for the trimethylsilylation of a wide variety of alcohols, including primary, allylic, benzylic, secondary, hindered secondary, tertiary, and phenols with hexamethyldisilazane on the surface of silica gel dispersed with LiClO4 in room temperature at few minutes in excellent yields under neutral conditions is reported. This procedure also allows the excellent selectivity under LP-SiO2 system for silylation
An Efficient Method for the Protection of Alcohols and Phenols by Using Hexamethyldisilazane in the Presence of Cupric Sulfate Pentahydrate under Neutral Reaction Conditions
作者:Batool Akhlaghinia、Sedigheh Tavakoli
DOI:10.1055/s-2005-865318
日期:——
Alcohols and phenols are protected with hexamethyldisilazane in the presence of cupric sulfate pentahydrate in good to excellent yields in acetonitrile. The method is highly selective for the conversion of primary alcohols in the presence of secondary and tertiary alcohols as well as phenols.
Elucidation of the regio- and chemoselectivity of enzymatic allylic oxidations with <i>Pleurotus sapidus</i> – conversion of selected spirocyclic terpenoids and computational analysis
作者:Verena Weidmann、Mathias Schaffrath、Holger Zorn、Julia Rehbein、Wolfgang Maison
DOI:10.3762/bjoc.9.262
日期:——
Allylic oxidations of olefins to enones allow the efficient synthesis of value-added products from simple olefinic precursors like terpenes or terpenoids. Biocatalytic variants have a large potential for industrial applications, particularly in the pharmaceutical and food industry. Herein we report efficient biocatalytic allylic oxidations of spirocyclic terpenoids by a lyophilisate of the edible fungus
Variants of the Prins Cyclization for the Synthesis of Terpenoid Spiroethers and Oxabicyclo[3.3.1]Nonane Derivatives
作者:Verena Weidmann、Jasper Ploog、Serge Kliewer、Mathias Schaffrath、Wolfgang Maison
DOI:10.1021/jo501755x
日期:2014.11.7
alkylation, gave benzoannelated oxabicyclo[3.3.1]nonane derivatives. Different reaction pathways may be triggered by the reaction temperature to give with good selectivity either tetrahydropyran derivatives as conventional Prins products or oxabicyclo[3.3.1]nonane derivatives.