Design, Synthesis, and Characterization of 3-(Benzylidene)indolin-2-one Derivatives as Ligands for α-Synuclein Fibrils
作者:Wenhua Chu、Dong Zhou、Vrinda Gaba、Jialu Liu、Shihong Li、Xin Peng、Jinbin Xu、Dhruva Dhavale、Devika P. Bagchi、André d’Avignon、Naomi B. Shakerdge、Brian J. Bacskai、Zhude Tu、Paul T. Kotzbauer、Robert H. Mach
DOI:10.1021/acs.jmedchem.5b00571
日期:2015.8.13
A series of 3-(benzylidine)indolin-2-one derivatives were synthesized and evaluated for their in vitro binding to alpha synuclein (alpha-syn), beta amyloid (A beta), and tau fibrils. Compounds with a single double bond in the 3-position had only a modest affinity for alpha-syn and no selectivity for alpha-syn versus A beta or tau fibrils. Homologation to the corresponding diene analogues yielded a mixture of Z,E and E,E isomers; substitution of the indoline nitrogen with an N-benzyl group resulted in increased binding to alpha-syn and reasonable selectivity for alpha-syn versus and tau. Introduction of a para-nitro group into the benzene ring of the diene enabled separation of the Z,E and E,E isomers and led to the identification of the Z,E configuration as the more active regioisomer. The data described here provide key structural information in the design of probes which bind preferentially to alpha-syn versus A beta or tau fibrils.