Solvent-free tetrahydropyranylation of alcohols catalyzed by amine methanesulfonates
作者:Rui Wang、MingZhu Sun、Heng Jiang
DOI:10.1007/s11164-010-0222-6
日期:2011.1
A comparative study of tetrahydropyranylation of alcohols under various solvents or solvent-free conditions using different amine methanesulfonates as catalysts shows that tetrahydropyranyl ethers of alcohols are obtained under solvent-free conditions in good yields using catalytic amounts of triethylenediamine methanesulfonate, 1,6-hexanediamine methanesulfonate, diethylenetriamine methanesulfonate and pyridine methanesulfonate, respectively. The reaction occurs readily in short times at room temperature catalyzed by these catalysts, especially triethylenediamine methanesulfonate. Some of the major advantages of this procedure are that the catalysts are environmentally friendly, highly effective, and easy to prepare and handle. The reaction is also clean and needs no solvent, and the work-up is very simple.
Copper nitrate/acetic acid as an efficient synergistic catalytic system for the chemoselective tetrahydropyranylation of alcohols and phenols
作者:Min Wang、Zhi-Guo Song、Hong Gong、Heng Jiang
DOI:10.1007/s00706-008-0051-0
日期:2009.2
ylation of alcohols and phenols was accomplished successfully using copper nitrate and acetic acid as a synergistic catalyst at room temperature under solvent-free condition. Compared with other synergistic catalytic systems, copper nitrate/acetic acid proved to be the most efficient. Both alcohols (primary, secondary, tertiary, benzylic, cyclic, allyl, cinnamyl, and furyl) and phenols reacted smoothly
Copper p-toluenesulfonate/acetic acid: a recyclable synergistic catalytic system for the tetrahydropyranylation of alcohols and phenols
作者:Min Wang、Zhi-Guo Song、Heng Jiang、Hong Gong
DOI:10.1007/s00706-007-0821-0
日期:2008.6
Copper p-toluenesulfonate/acetic acid was found to be an efficient, chemoselective synergistic catalytic system, with catalyst loading as low as 0.3 mol% leading to clean, high-yielding tetrahydropyranylation of a variety of alcohols and phenols. By simple phase-separation, copper p-toluenesulfonate can be easily recovered and reused for several times without deterioration in catalytic activity.