Cholinesterase inhibitors: SAR and enzyme inhibitory activity of 3-[ω-(benzylmethylamino)alkoxy]xanthen-9-ones
摘要:
In this work, we further investigated a previously introduced class of cholinesterase inhibitors. The removal of the carbarnic function from the lead compound xanthostigmine led to a reversible cholinesterase inhibitors 3. Some new 3-[omega-(benzylmethylamino)alkoxy]xanthen-9-one analogs were designed, synthesized, and evaluated for their inhibitory activity against both acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). The length of the alkoxy chain of compound 3 was increased and different substituents were introduced. From the IC50 values, it clearly appears that the carbamic residue is crucial to obtain highly potent AChE inhibitors. On the other hand, peculiarity of these compounds is the high selectivity toward BuChE with respect to AChE, being compound 12 the most selective one (6000-fold). The development of selective BuChE inhibitors may be of great interest to clarify the physiological role of this enzyme and to provide novel therapeutics for various diseases. (c) 2006 Elsevier Ltd. All rights reserved.
Efficient Synthesis of New 4-Arylideneimidazolin-5-ones Related to the GFP Chromophore by 2+3 Cyclocondensation of Arylideneimines with Imidate Ylides
作者:Janusz Kowalik、Anthony Baldridge、Laren Tolbert
DOI:10.1055/s-0029-1218796
日期:2010.7
A 2+3 condensation of a wide assortment of Schiff bases, prepared from aromatic aldehydes and primary amines, with methyl 2-(1-ethoxyethylideneamino)acetate allows convenient access to an extensive family of substituted 4-arylideneimidazolin-5-one analogues of the green fluorescent protein (GFP) chromophore. 4-arylideneimidazolin-5-one - azomethine ylide - Schiff bases - heterocycle - 2+3 cycloaddition