Selective, Convenient and Efficient Deprotection of Trimethylsilyl and Tetrahydropyranyl Ethers, Ethylene Acetals and Ketals with Oxone under Non-aqueous Conditions
An efficient and selective method for the deprotection of trimethylsilyl (TMS) and tetrahydropyranyl (THP) ethers, ethylene acetals and ketals to their corresponding alcohols and carbonyl compounds using oxone in refluxing acetonitrile is described. Excellent chemoselectivity of this method makes it a useful and practical procedure in organic synthesis.
Mild and Efficient Chemoselective Tetrahydropyranylation of Alcohols Using Brønsted Acidic Ionic Liquid as Catalyst Under Solvent-Free Conditions
作者:Abdol R. Hajipour、Zahra Nasresfahani
DOI:10.1080/00397911.2010.551286
日期:2012.7.1
Abstract A straightforward and efficient method for preparation of morpholinium bisulfate ([mroH]HSO4) as a novel acidic ionic liquid is reported. The application of this efficient and inexpensive acidic ionic liquid catalyst for tetrahydropyranylation of alcoholsundermild and solvent-freeconditions at room was investigated. GRAPHICAL ABSTRACT
Efficient One-Step Conversion of Tetrahydropyranyl Ethers into Acetates and Formates in the Presence of Potassium Dodecatungstocobaltate K5CoW12O40 · 3H2O
作者:E. Rafiee、Sh. Tangestaninejad、M. H. Habibi、I. Mohammadpoor-Baltork、V. Mirkhani
DOI:10.1007/s11178-005-0176-0
日期:2005.3
Tetrahydropyranyl ethers derived from primary alcohols were directly and efficiently converted into the corresponding acetates and formates by the action of ethyl acetate, acetic acid, acetic anhydride, and ethyl formate in the presence of a catalytic amount of potassium dodecatungstocobaltate K5CoW12O40 · 3H2O. Tetrahydropyranyl ethers derived from secondary alcohols and phenols can also be transformed into the corresponding acetates with the use of acetic anhydride, but K5CoW12O40 · 3H2O was ineffective for esterification with ethyl acetate, acetic acid, and ethyl formate.
OXIDATIVE DEPROTECTION OF TRIMETHYLSILYL ETHERS, TETRAHYDROPYRANYL ETHERS, AND ETHYLENE ACETALS WITH BENZYLTRIPHENYLPHOSPHONIUM PEROXYMONOSULFATE UNDER MICROWAVE IRRADIATION
作者:A. R. Hajipour、S. E. Mallakpour、I. M. Baltork、H. Adibi
DOI:10.1081/scc-100103980
日期:2001.1
This paper describes the oxidation deprotection of trimethylsilyl ethers, tetrahydrophyranyl ethers and deprotection of ethylene acetals to afford carbonyl compounds using benzyltriphenylphosphonium peroxymonosulfate (1) (PhCH2PPh3HSO5) in the presence of a catalytic amount of bismuth chloride under microwave irradiation. This reagent is a stable white powder, which has been prepared by the dropwise
AN EASY AND FAST METHOD FOR OXIDATIVE DEPROTECTION OF TRIMETHYLSILYL ETHERS, TETRAHYDROPYRANYL ETHERS, AND ETHYLENE ACETALS WITH KMnO<sub>4</sub> SUPPORTED ON ALUMINA UNDER SOLVENT-FREE CONDITIONS
作者:A. R. Hajipour、S E. Mallakpour、I. M. Baltork、H. Backnezhad
DOI:10.1081/scc-120002518
日期:2002.1.1
ABSTRACT A manipulatively simple and rapid method for oxidation deprotection of trimethylsilylethers, tetrahydropyranyl ethers and deprotection of ethylene acetals to afford carbonyl compounds undersolvent-freeconditions in the presence or absence of alumina with potassium permanganate.