Synthesis of biotinylated photoaffinity probes based on arylsulfonamide γ-secretase inhibitors
摘要:
Synthesis and biological evaluation of an arylsulfonamide class of gamma-secretase inhibitors are described. Design, synthesis, and biological evaluation of multifunctional molecular probes harboring a benzophenone photophore as a cross-linking group and a biotin tag are also reported. (c) 2006 Elsevier Ltd. All rights reserved.
Amidines. VIII. A kinetic study of alcoholysis of N1-arenesulfonyl-N1,N2-diarylacetamidines.
作者:Machiko ONO、Reiko TODORIKI、Shinzo TAMURA
DOI:10.1248/cpb.39.558
日期:——
Alcoholysis of N1-Arenesulfonyl-N1, N2-diarylacetamidines (1-30) was studied kinetically. The rate of the reaction between the substrates and ethoxide ion depended on the electron-withdrawing resonance effect of the substituents on both the N1-aryl and N2-aryl groups to a similar extent. The rate of the neutral alcoholysis depended on the resonance effect of the N1-aryl substituent to a larger extent than in the former reaction, and depended hardly at all on the electron-releasing resonance effect of the N2-aryl substituent, showing that the reaction does not proceed by the solvolysis mechanism.A reaction mechanism is proposed in which the rate-determining attack of the nucleophile is accompanied by the concerted departure of the N-arylarenesulfonamide group.