Highly Regioselective Transformation of out/out-equatorial Bis(formylmethano)[60]fullerenes: Construction of Dissymmetric [60]Fullerene-Centered Triads
摘要:
[GRAPHICS]Three kinds of out/out-equatorial bis( formylmethano)[ 60] fullerenes ( 1b-d) were obtained by the tether-directed bifunctionalization of [ 60] fullerene with bis( alpha-formylsulfonium ylide) s. The condensation of aromatic amines with 1b-d proceeded with an unexpectedly high regioselectivity to give one of two possible regioisomers of mono-imines as the main products ( the ratio of the regioisomers, up to 97: 3). By the transformation of the remaining formyl group in the mono-imines thus obtained, the corresponding dissymmetric bis-imines were efficiently synthesized.
Highly Regioselective Transformation of out/out-equatorial Bis(formylmethano)[60]fullerenes: Construction of Dissymmetric [60]Fullerene-Centered Triads
摘要:
[GRAPHICS]Three kinds of out/out-equatorial bis( formylmethano)[ 60] fullerenes ( 1b-d) were obtained by the tether-directed bifunctionalization of [ 60] fullerene with bis( alpha-formylsulfonium ylide) s. The condensation of aromatic amines with 1b-d proceeded with an unexpectedly high regioselectivity to give one of two possible regioisomers of mono-imines as the main products ( the ratio of the regioisomers, up to 97: 3). By the transformation of the remaining formyl group in the mono-imines thus obtained, the corresponding dissymmetric bis-imines were efficiently synthesized.
Three new series comprising 24 novel cationic choline analogues and consisting of mono- or his (N or C-5-duplicated) thiazolium salts have been synthesized. Bis-thiazolium salts showed potent antimalarial activity (much superior to monothiazoliums). Among them, bis-thiazolium salts 12 and 13 exhibited IC50 values of 2.25 nM and 0.65 nM, respectively, against P. falciparum in vitro. These compounds also demonstrated good in vivo activity (ED50 <= 0.22 mg/kg), and low toxicity in mice infected by Plasmodium vinckei.