Treatment of different types of alcohols with tetrahydrofuran (THF) in the presence of VCl3 and CCl4 smoothly afforded the corresponding THF-based acetals in excellent yields. The reaction is fast at room temperature, and several functional groups are tolerated, with no racemization being observed. A radical mechanism, based on Cl3C. as the active species, is proposed for this novel kind of transformation
Environmentally Friendly Tetrahydrofuranylation of Alcohols Using NaHSO<sub>4</sub>–SiO<sub>2</sub> under Solvent-free Conditions
作者:Henok H. Kinfe、Sullivan Terblanche、Konanani D. Tshivhase、Livhuwani Ravhura
DOI:10.1246/cl.2012.272
日期:2012.3.5
A simple, environmentally friendly, and efficient tetrahydrofuranylation of alcohols has been developed using NaHSO4–SiO2 (0.5 mol %) as a catalyst under solvent-free conditions to yield corresponding THF ethers in good to excellent yields.
Trialkylphosphonium oxoborates as C(sp<sup>3</sup>)–H oxyanion holes and their application in catalytic chemoselective acetalization
作者:Vincent Ming-Yau Leung、Hong-Chai Fabio Wong、Chun-Man Pook、Ying-Lung Steve Tse、Ying-Yeung Yeung
DOI:10.1039/d3sc03081d
日期:——
borate counter anion in a TOB catalyst increases the availability of C(sp3)–H to interact with electron donor substrates. The catalytic protocol is applicable to a wide range of substrates in the acetalization reaction and provides excellent chemoselectivity in the acetalization over thioacetalization in the presence of alcohols and thiols, which is otherwise hard to achieve using typical acid catalysts
A Convenient Synthesis of 2-Tetrahydrofuranyl Ethers
作者:Rachid Baati、Alain Valleix、Charles Mioskowski、D. K. Barma、J. R. Falck
DOI:10.1021/ol991332f
日期:2000.2.1
[GRAPHICS]A wide spectrum of alcohols and phenols are readily transformed to the corresponding 2-tetrahydrofuranyl ethers in good to excellent yields using CrCl2 and CCl4 in THF under nearly neutral conditions at room temperature.
An efficient and extremely mild method for protecting alcohols as 2-tetrahydrofuranyl ethers
作者:Jenny M Barks、Bruce C Gilbert、Andrew F Parsons、Bala Upeandran
DOI:10.1016/s0040-4039(00)01045-5
日期:2000.8
Reaction of primary or secondary alcohols with BrCCl3 and tetrahydrofuran, usually in the presence of 2,4,6-collidine, leads to the formation of 2-tetrahydrofuranyl ethers in good to excellent yield (56-92%). The reaction mechanism is believed to involve a free-radical chain reaction. (C) 2000 Elsevier Science Ltd. All rights reserved.