Based on the presence of dialkyl phosphate moiety, we evaluated twenty-seven salicylanilide diethyl phosphates (diethyl [2-(phenylcarbamoyl) phenyl] phosphates) for the inhibition of acetylcholinesterase (AChE) from electric eel (Electrophorus electricus L.) and butyrylcholinesterase (BChE) from equine serum. Ellman's spectrophotometric method was used. The inhibitory activity (expressed as IC50 values) was compared with that of the established drugs galantamine and rivastigmine. Salicylanilide diethyl phosphates showed significant activity against both cholinesterases with IC50 values from 0.903 to 86.3 mu M. IC(50)s for BChE were comparatively lower than those obtained for AChE. All of the investigated compounds showed higher inhibition of AChE than rivastigmine, and six of them inhibited BChE more effectively than both rivastigmine and galantamine. In general, derivatives of 4-chlorosalicylic acid showed enhanced activity when compared to derivatives of 5-halogenated salicylic acids, especially against BChE. The most effective inhibitor of AChE was O-5-chloro-2-[(3-bromophenyl) carbamoyl] phenyl} O, O-diethyl phosphate with IC50 of 35.4 mu M, which is also one of the most potent inhibitors of BChE. O-5-Chloro-2-[( 3,4-dichlorophenyl) carbamoyl] phenyl} O, O-diethyl phosphate exhibited in vitro the strongest inhibition of BChE (0.90 mu M). Salicylanilide diethyl phosphates act as pseudo-irreversible cholinesterases inhibitors. (C) 2014 Elsevier Inc. All rights reserved.
Salicylanilide diethyl phosphates: Synthesis, antimicrobial activity and cytotoxicity
series of 27 salicylanilide diethylphosphates was prepared as a part of our on-going search for new antimicrobial active drugs. All compounds exhibited in vitro activity against Mycobacterium tuberculosis, Mycobacterium kansasii and Mycobacterium avium strains, with minimum inhibitory concentration (MIC) values of 0.5–62.5 μmol/L. Selected salicylanilide diethylphosphates also inhibit multidrug-resistant
作为我们持续寻找新的抗菌活性药物的一部分,制备了一系列27种水杨酰苯胺二乙基磷酸酯。所有化合物均具有针对结核分枝杆菌,堪萨斯分枝杆菌和鸟分枝杆菌菌株的体外活性,最低抑菌浓度(MIC)值为0.5–62.5μmol/ L。选定的水杨酰苯胺二乙基磷酸酯还可以以1μmol/ L的浓度抑制耐多药结核病菌株。水杨酰苯胺二乙基磷酸酯也主要表现出对革兰氏阳性细菌的活性(MIC⩾1.95μmol/ L),而其抗真菌活性却明显较低。IC 50 Hep G2细胞的MCI值在1.56-33.82μmol/ L的范围内,但与分枝杆菌的MIC并没有直接相关性。