Solution- and solid-phase synthesis of combinatorial libraries of trisubstituted 1,3,5-triazines

A general synthesis of trisusbstituted 1,3,5-triazines of types (4) and (5) by condensation of amidines (2) and thiouronium salts (3) with dimethyl cyanoiminodithiocarbonate (1) was first established in solution (Scheme 1). Further investigations were directed toward a multidirectional cleavage procedure of the 2-alkylsulfinyl intermediates with different nucleophiles to form highly substituted 1,3,5-triazines of type (8) and (9). This methodology was successfully transferred onto solid support taking advantages of a sulfur-based safety catch linkage, using the polymer-bound thiouronium salt (11) (Scheme 3). In addition, other compounds libraries were chemoselectively generated on solid support in good to excellent yields combining both solution- and solid-phase synthesis, starting from a resin-bound thiol (15) and cyanuric chloride (16) (Scheme 4).