A series of mono-, bis-, and trissubstituted pyridinium and pyrylium dyes have been synthesized by the condensation of methylpyridinium and methylpyrylium salts with aldehydes or nitroso compound. Large bathochromic shifts were observed in the following order, both in substituted azomethine pyridinium and pyrylium dyes, mono < bis < tris. The magnitude of the shift appeared in the order of multiple
Carbonic anhydrase inhibitors. Part 24. A quantitative structure-activity relationship study of positively charged sulfonamide inhibitors
作者:CT Supuran、BW Clare
DOI:10.1016/0223-5234(96)88286-9
日期:1995.1
A quantitative structure-activity relationship (QSAR) study is presented for 28 carbonic anhydrase inhibitors (CAIs), derivatives of tri-, tetra- and penta-substituted 1-(2-sulfonamido-1,3,4-thiadiazol-5-yl)pyridinium perchlorates. Several of these derivatives are new compounds and their synthesis and properties are also reported. The conclusion of the study is that activity is greatly modulated by electronic effects on the pyridinium ring. The most significant effects were enhancement of activity with increased positive charge on this ring, weakening of activity with increasing HOMO energy, and a dependence on anisotropic polarizability which may be attributable to London forces.