Efficient Tetrahydropyranylation of Alcohols and Detetrahydropyranylation Reactions in the Presence of Catalytic Amount of Trichloroisocyanuric Acid (TCCA) as a Safe, Cheap Industrial Chemical
Abstract Preparation and cleavage of THP ethers of different hydroxy functional groups are easily and efficiently performed in the presence of trichloroisocyanuric acid (TCCA) in the absence of solvent with high yields.
A Highly Efficient Synthetic Protocol for Tetrahydropyranylation/Depyranylation of Alcohols and Phenols
作者:Abu T. Khan、Subrata Ghosh、Lokman H. Choudhury
DOI:10.1002/ejoc.200500400
日期:2005.11
Bismuth(III) nitrate pentahydrate [Bi(NO3)3·5H2O] is found to be an effective catalyst for both tetrahydropyranylation and depyranylation of alcohols and phenols. Some of the major advantages of this protocol are: non-aqueous workup, good yields, the involvement of a less-expensive and nontoxic catalyst, and compatibility in the presence of a large number of other protecting groups. Notably, isopropylidene
Allyltriphenylphosphonium Peroxodisulfate (CH<sub>2</sub>˭CHCH<sub>2</sub>PPh<sub>3</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>: An Efficient and Convenient Reagent for the Oxidation of Alcohols and Silyl and THP‐Ethers Under Nonaqueous Conditions
作者:M. Tajbakhsh、M. M. Lakouraj、A. Fadavi
DOI:10.1081/scc-120030303
日期:2004.12.31
Abstract The preparation of allyltriphenylphosphonium peroxodisulfate (ATPPD) as a new and efficient reagent for the oxidation of primary and secondary alcohols, trimethylsilyl and tetrahydropyranyl (THP) ethers to their corresponding carbonyl compounds in refluxing acetonitrile with 1.1:1 molar equivalents of the oxidant is described.
Chlorodiphenylphosphine as Highly Selective and Efficient Reagent for the Conversion of Alcohols, Tetrahydropyranyl and Silyl Ethers to Thiocyanates and Isothiocyanates
作者:Ghasem Aghapour、Ameneh Asgharzadeh
DOI:10.1080/10426507.2013.855771
日期:2014.6.3
efficient method is described for the conversion of primary alcohols, tetrahydropyranyl and silyl ethers to thiocyanates by use of chlorodiphenylphosphine and ammonium thiocyanate. Secondary substrates produce both the two isomeric products, thiocyanate and isothiocyanate, while tertiary ones give isothiocyanates as the only products by this newmethod. In contrast to previously reported methods based
An imidazolium based Brønsted–Lewis acidicionicliquid has been shown to be an excellent catalyst and reaction medium for the tetrahydropyranylation of various alcohols in good to excellent yields with short reaction times. Selective protection of benzyl alcohol in the presence of phenol was achieved. The novel ionicliquid was prepared from readily available starting materials and could be easily