Synthesis and evaluation of stilbenylbenzoxazole and stilbenylbenzothiazole derivatives for detecting beta-amyloid fibrils

Abstract

This paper describes a novel series of stilbenylbenzoxazole ( SBO) and stilbenylbenzothiazole ( SBT) derivatives for beta- amyloid specific binding probes. These 24 compounds were synthesized and evaluated by competitive binding assay against beta- amyloid 1 - 42 ( A beta 42) aggregates using [I-125] TZDM. All the derivatives displayed higher binding affinities with K-i value in the subnanomolar range ( 0.10 - 0.74 nM) than Pittsburgh Compound- B ( PIB) ( 0.77 nM). Among these derivatives, SBT- 2, 5-. uoroethoxy- 2-{ 4-[ 2-( 4- methylaminophenyl) vinyl] phenyl} benzothiazole, showed lowest K-i value ( 0.10 nM). In conclusion, the preliminary results suggest that these compounds are implying a possibility as a probe for detection of A beta fibrils in Alzheimer's disease (AD) patients. (C) 2007 Elsevier Ltd. All rights reserved.