An efficient method
for the synthesis of [1,2,4]triazolo[4,3-a]piperazine
derivatives was established based on
a gold(I)-catalyzed domino cyclization of an amidrazone substrate
with a terminal alkyne. The amidoxime congeners were converted into
[1,2,4]oxadiazolo[4,5-a]piperazine derivatives
in the presence of a gold catalyst. The oxadiazolopiperazine
is a promising scaffold for the design of novel inhibitors against
p38 mitogen activated protein kinase (MAP kinase).