Hydroxytyrosol, a natural polyphenol that can be extracted from olive mill waste waters, was converted into a series of more complex and lipophilic analogues by conjugation with other naturally derived (poly)phenolicfragments. Ether and triazole linkers were employed. A small library of compounds was prepared, stressing step economy and operational simplicity. Some of these substances were proven
Abstract A facile protocol to the chemoselective deprotection of aryl t-butyldimethylsilyl (TBDMS) ethers using Na3PO4 · 12H2O as promoter is described. From aryl TBDMS ethers to the corresponding phenols, the TBDMS group could be cleaved in the presence of 0.5 equivalent of Na3PO4 · 12H2O in dimethylformamide at room temperature with good to excellent yields in the presence of other common protecting
seven-membered enone compound, the key intermediate of our previous synthesis of the inside-outside framework of 13-oxyingenol in racemic form, was achieved by using asymmetric cyclopropanation and reductive deoxygenation as key steps. 13-oxyingenol - asymmetric cyclopropanation - chiral aza-semicorrin ligand - reductive deoxygenation - intramolecular aldol reaction
A mild and efficient selective tetrahydropyranylation of primary alcohols and deprotection of THP ethers of phenols and alcohols using PdCl2(CH3CN)2 as catalyst
作者:Yan-Guang Wang、Xiao-Xing Wu、Zhi-Yong Jiang
DOI:10.1016/j.tetlet.2004.02.057
日期:2004.3
Primary alcohols were selectively tetrahydropyranylated in good to excellent yields at room temperature using PdCl2(CH3CN)2 as catalyst in tetrahydrofuran (THF) in the presence of phenols, secondary, and tertiary alcohols. The tetrahydropyranyl (THP) group could be efficiently removed using PdCl2(CH3CN)2 as catalyst in CH3CN, while other protection groups such as p-toluenesulfonyl (Ts), tert-butyldiphenylsilyl