SEARCH Articles Figures Tables Acid-Catalyzed Condensations of Heterocyclic Compounds and Aldehydes C-Methylation of heterocyclics N-condensed Condensed 1,2,4-triazines: I. Fused heterocycles with three-, four-, and Condensed 1,2,4-triazines: I. Fused heterocycles with three-, four-, and fivemembered rings Condensed l,2,4-triazolo heterocycles Condensed l,2,4-triazolo heterocycles synthesis Heterocycle library synthesis multicomponent condensation reactions Heterocyclic compounds condensed Heterocyclics condensed Heterocyclics condensed Pictet-Spengler condensation heterocyclic synthesis Quinones with a Condensed Four-Membered Heterocyclic Ring Tautomerism of Heterocycles: Condensed Five-Six