[EN] DICARBAMATE INHIBITORS OF NS5A FOR TREATMENT OF HEPATITIS C VIRUS INFECTIONS AND RELATED DISEASES [FR] INHIBITEURS DICARBAMATE DE NS5A POUR LE TRAITEMENT D'INFECTIONS PAR LE VIRUS DE L'HÉPATITE C ET DE MALADIES ASSOCIÉES
[EN] DICARBAMATE INHIBITORS OF NS5A FOR TREATMENT OF HEPATITIS C VIRUS INFECTIONS AND RELATED DISEASES [FR] INHIBITEURS DICARBAMATE DE NS5A POUR LE TRAITEMENT D'INFECTIONS PAR LE VIRUS DE L'HÉPATITE C ET DE MALADIES ASSOCIÉES
A bis(boronate) compound (1) in which boronate components are situated on the same side of the planar s-indacene framework is synthesized from 1,5-dihydro-1,1,5,5-tetramethyl-s-indacene by OsO4-catalyzed dihydroxylation in the presence of dihydroxyphenylborane. The property of 1 as a host molecule has been examined with various compounds. The host 1 forms a 1 : 1 complex with 4-dimethylaminopyridine (DMAP) when an equimolar amount of DMAP is added; more concave-type complexes (2) are formed than convex-type complexes (3). When excess amounts of DMAP are present, a 1 : DMAP = 1 : 2 complex (4) can be isolated as a single crystal. This complex can be characterized by NMR measurements and X-ray analyses. These analyses indicate that the concave-type complex 2 does not have a bidentate coordination between the two boron–nitrogen atoms as proposed previously, but has a monodentate coordination form.