Carbon Tetrabromide/Sodium Triphenylphosphine-m-sulfonate (TPPMS) as an Efficient and Easily Recoverable Catalyst for Acetalization and Tetrahydropyranylation Reactions
作者:Congde Huo、Tak Hang Chan
DOI:10.1002/adsc.200900102
日期:——
A solid complex, conveniently prepared from carbontetrabromide and sodiumtriphenylphosphine-m-sulfonate (TPPMS), can be used as an easilyrecoverablecatalyst for the selective acetalization of aldehydes and tetrahydropyranylation of alcohols. The catalyst can be recovered by simple precipitation with ether and can be reused at least 7 times without loss of catalytic activity.
Flexible and General Synthesis of Functionalized Phosphoisoprenoids for the Study of Prenylation in vivo and in vitro
作者:Debapratim Das、Zakir Tnimov、Uyen T. T. Nguyen、Govindaraju Thimmaiah、Harriet Lo、Daniel Abankwa、Yaowen Wu、Roger S. Goody、Herbert Waldmann、Kirill Alexandrov
DOI:10.1002/cbic.201100733
日期:2012.3.19
Prenylation probes: Eukaryotic protein prenyltransferases modify polypeptides with isoprenoid lipids. Modification of isoprenoids with reporter groups allows the creation of probes for the analysis of protein prenylation in vitro and in vivo. An amine‐derivatized isoprenoid scaffold was used as a novel starting point for the synthesis of functionalizedphosphoisoprenoid libraries.
Bismuth trichloride as mild reagent, has been found to be a worthful catalyst for tetrahydropyranylation of 1º, 2 º, 3º, allylic, benzylic alcohols, and symmetric di-ols. At room temperature the reagent THP(3,4–dihydro-2H-pyran) was successfully employed as pyranylating agent in presence of BiCl3 catalyst without the use of a solvent and the yields of the products were found to be 90-96%. Further, the depyranylation of alcohols was achieved in quantitative yield by simple addition of MeOH using the same catalyst. The developed method was showed good chemo-selectivity in symmetrical diols for mono THP protection.
A Mild, Efficient and Sustainable Tetrahydropyranylation of Alcohols Promoted by Acidic Natural Deep Eutectic Solvents
作者:Davide Arnodo、Eugenio De Nardo、Simone Ghinato、Salvatore Baldino、Marco Blangetti、Cristina Prandi
DOI:10.1002/cssc.202202066
日期:2023.2.8
A simple, scalable, and sustainable access to tetrahydropyranyl (THP) ethers from alcohols was achieved exploiting the dual role of acidic natural deep eutectic solvents (NADESs) both as catalysts and reaction media, working under bench-type and mild reaction conditions. The easy scalability of the process and the recyclability of the NADES add great value in terms of efficiency and environmentally
Aniline–terephthalaldehyde resin p-toluenesulfonic acid (ATRT) salt as efficient mild polymeric solid acid catalyst
作者:Kiyoshi Tanemura、Tsuneo Suzuki
DOI:10.1016/j.tetlet.2013.09.137
日期:2013.12
Aniline-terephthalaldehyde resin p-toluenesulfonic acid (ATRT) salt was easily prepared by the reaction of aniline with 1.25 equiv of terephthalaldehyde in the presence of 1.0 equiv of p-toluenesulfonic acid at 75 degrees C for 24 h in EtOH. ATRT efficiently catalyzed the tetrahydropyranylation of alcohols and deprotection of tetrahydropyranyl (THP), triethylsilyl (TES), and tert-butyldimethylsilyl (TBDMS) ethers. Deprotection of dodecyl THP ether and dodecyl TBDMS ether catalyzed by ATRT proceeded faster than those by pyridinium p-toluenesulfonate (PPTS). ATRT was reused without significant loss of activities. (C) 2013 Elsevier Ltd. All rights reserved.