This invention relates to generally inhibiting histone deacetylase (“HDAC”) enzymes (e.g., HDAC1, HDAC2, and HDAC3) using compounds of formula (I),
wherein the substituents are as defined herein.
The Heck-Mizoroki reaction of 1-protected-4-iodo-1H-pyrazoles with various kinds of alkenes was examined and found to yield 1-protected-4-alkenyl-1H-pyrazoles. P(OEt)(3) was a suitable ligand for the cross-coupling reaction, together with the trityl group that acted as an appropriate protecting group of 1H-pyrazole.