Aromatic acetates were selectively deprotected in the presence of aliphatic acetates to the corresponding phenols in excellent yields using Amberlyst-15 or iodine as catalysts in methanol at room temperature. The first catalyst can be recovered. (C) 2003 Elsevier Science Ltd. All rights reserved.
Enzymatic Production of Both Enantiomers of Rhododendrol
作者:Musa M. Musa
DOI:10.14233/ajchem.2014.16581
日期:——
An asymmetric synthetic approach to produce (R)- and (S)-rhododendrol is described. W110A Thermoanaerobacter ethanolicus secondary alcohol dehydrogenase (W110A TeSADH), an (S)-specific mutant of TeSADH, is used in this approach. The enantioselective reduction of 4-(4-hydroxyphenyl)-2-butanone catalyzed by W110A TeSADH yielded (S)-rhododendrol, the Prelog product. The anti-Prelog product, (R)-rhododendrol, is produced from (rac)-rhododendrol through enantiospecific kinetic resolution catalyzed by W110A TeSADH.
A mild, highly selective and remarkably easy procedure for deprotection of aromatic acetates using ammonium acetate as a neutral catalyst in aqueous medium
作者:C Ramesh、G Mahender、N Ravindranath、Biswanath Das
DOI:10.1016/s0040-4020(02)01635-6
日期:2003.2
Ammoniumacetate was found to catalyze efficiently the selective deprotection of aromatic acetates in the presence of various sensitive functionalities in aqueous methanol under neutral conditions at room temperature to yield the corresponding phenols in excellent yields. The method has been utilized for deprotection of acetates of several naturally occurring bioactive phenolic compounds and for preparation