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
Six novel cleomiscosin A (a coumarino-lignoid), derivatives have been synthesized for the first time by using electrophilic substitution reaction to give nuclear nitrated and halogenated derivatives of cleomiscosin A in good yields. Structures of these compounds were established on the basis of IR, H-1 NMR, C-13 NMR and Mass spectral data. Some of the synthesized derivatives were tested for in-vitro target based anti-inflammatory study using primary macrophages cell culture bioassay system. The results showed that the compounds 1a, 3a and 4a (1 and 10 mu g/mL) exhibited potent anti-inflammatory activity. (C) 2010 Elsevier Masson SAS. All rights reserved.
TANAKA, HITOSHI;ISHIHARA, MASAYA;ICHINO, KAZUHIKO;ITO, FAZUO, HETEROCYCLES, 27,(1989) N1, C. 2651-2658