Poly(N-bromo-N-ethyl-benzene-1,3-disulfonamide), N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide as new efficient reagents for conversion of alcohols to THP ethers and aldehydes to oxazoline compounds
作者:R. Ghorbani-Vaghei、S. Akbari-Dadamahaleh、M. Amiri
DOI:10.1007/bf03246014
日期:2010.6
paper is concerned with an easy preparation of THP ethers from primary, secondary and tertiary alcohols and oxazoline compounds from various aldehydes using poly(N-bromo-N-ethyl-benzene-1,3-disulfonamide), N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide [TBBDA] as new and efficient reagents under ambient conditions without over-oxidation.
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.
Tetrahydropyranylation of Alcohols and Phenols Using the Synergistic Catalyst System, Copper(II) Chloride-Acetic Acid
作者:Min Wang、Zhi-Guo Song、Heng Jiang、Hong Gong
DOI:10.1007/s00706-007-0631-4
日期:2007.6
Copper(II) chloride-acetic acid was found to be an efficient synergistic catalytic system for the tetraphydropyranylation of various alcohols and phenols in high yields at room temperature in short reaction times.
Magnetic Fe<sub>3</sub>O<sub>4</sub>@silica sulfuric acid nanoparticles promoted regioselective protection/deprotection of alcohols with dihydropyran under solvent-free conditions
Protection (and deprotection) of hydroxylgroups via tetrahydropyranylation was carried out effectively using a catalytic amount of Fe3O4 supportedsilica sulphuric acid nanoparticles (Fe3O4@SiO2@SO3H) under solvent-free conditions. The synthesized nanocatalyst was characterized by XRD, TEM, FT-IR etc. A wide range of tetrahydropyranylated alcohol derivatives were synthesized using this heterogeneous
在无溶剂条件下,使用催化量的Fe 3 O 4负载的二氧化硅硫酸纳米颗粒(Fe 3 O 4 @SiO 2 @SO 3 H)有效地进行了通过四氢吡喃基化进行的羟基保护(和脱保护)。通过XRD,TEM,FT-IR等对合成的纳米催化剂进行了表征。使用这种多相磁性纳米催化剂,可以在10–20分钟内以高收率合成各种四氢吡喃基化的醇衍生物。另外,也可以使用相同的催化剂在MeOH存在下将四氢吡喃基醚脱保护为母体醇化合物。反应完成后,使用外部磁体很容易将催化剂从反应介质中分离出来,从而改善了整个合成过程。回收催化剂并将其再用于五个连续的反应中,而没有任何明显的活性损失。温和的反应条件,操作简便,无溶剂的条件,高选择性,磁性纳米催化剂的易回收性和高收率可被视为我们程序的优势。
Potassium dodecatangestocobaltate trihydrate (K 5 CoW 12 O 40 ·3H 2 O): a mild and efficient catalyst for the tetrahydropyranylation of alcohols and their detetrahydropyranylation
作者:Mohammad H Habibi、Shahram Tangestaninejad、Iraj Mohammadpoor-Baltork、Valiollah Mirkhani、Bahram Yadollahi
DOI:10.1016/s0040-4039(01)00298-2
日期:2001.4
A simple, mild and effective method for tetrahydropyranylation of a variety of alcohols and cleavage of their tetrahydropyranyl ethers at ambient temperature in the presence of K5CoW12O40·3H2O as the catalyst with high turnovers is described.
描述了一种简单,温和而有效的方法,该方法用于在室温下,在具有高周转率的催化剂K 5 CoW 12 O 40 ·3H 2 O的存在下,对多种醇进行四氢吡喃基化并裂解其四氢吡喃基醚。