De Novo Ring-Forming Consecutive Four-Component Syntheses of 4‑Pyrazolyl-1,2,3-triazoles from (Triisopropylsilyl)butadiyne as a C4 Building Block

4-Pyrazolyl-1,2,3-triazoles
can be readily synthesized in a one-pot
fashion and moderate yield by employing a consecutive four-component
process consisting of a sequentially Pd–Cu-catalyzed alkynylation-cyclocondensation-desilylation-CuAAC
process. Most distinctly, (tri­iso­propyl­silyl)­butadiyne
is employed as a four-carbon building block in this one-pot de novo
formation of both heterocyclic moieties.