A novel and highly efficient method for the silylation of alcohols with hexamethyldisilazane (HMDS) catalyzed by recyclable sulfonic acid-functionalized ordered nanoporous silica
作者:Daryoush Zareyee、Babak Karimi
DOI:10.1016/j.tetlet.2006.12.030
日期:2007.2
Silylation of alcohols with hexamethyldisilazane (HMDS) in dichloromethane provides the corresponding silyl ethers in almost quantitative yields at room temperature using 1–3 mol % of sulfonic acid-functionalized silica. Additionally, the catalyst displays a high activity and thermal stability (up to 240 °C) and it can be easily recovered and reused for at least 20 reaction cycles without loss of reactivity
Silylation of Alcohols and Phenols with Hexamethyldisilazane over Highly Reusable Propyl Sulfonic Acid Functionalized Nanostructured SBA-15
作者:Daryoush ZAREYEE、Rezvaneh ASGHARI、Mohammad A. KHALILZADEH
DOI:10.1016/s1872-2067(10)60300-2
日期:2011.11
Various alcohols and phenols were trimethylsilylated in excellent yields using hexamethyldisilazane in the presence of catalytic amounts of environmentally friendly, hydrophobic, highly thermal stable, and completely heterogeneous sulfonic acid functionalized mesostructured SBA-15 in dichloromethane at ambient temperature. Primary, bulky secondary, tertiary, and phenolic hydroxyl functional groups were transformed to the corresponding trimethylsilyl ethers in excellent yields. The simple experimental procedure was accompanied by easy recovery and the catalyst was reusable (at least 18 reaction cycles); these are attractive features of this protocol.
One-step conversion of silyl/THP ethers into the corresponding acetates
作者:Kusum L Chandra、P Saravanan、Vinod K Singh
DOI:10.1016/s0040-4039(01)00967-4
日期:2001.7
A variety of silyl and THP ethers were directly converted into the corresponding acetates using acetic anhydride in the presence of a catalytic amount of Cu(OTf)(2) in CH2Cl2. It was observed that MEM ethers could also be cleaved under the same conditions. The reaction was also studied with other Lewis acids. (C) 2001 Elsevier Science Ltd. All rights reserved.
KITA Y.; HARUTA J.; SEGAWA J.; TAMURA Y., TETRAHEDRON LETT., 1979, NO 44, 4311-4314
作者:KITA Y.、 HARUTA J.、 SEGAWA J.、 TAMURA Y.
DOI:——
日期:——
BRUNET, J. -J.;BESOZZI, D.;CAUBERE, P., SYNTHESIS, RD, 1982, N 9, 721-723