Abstract
A series of novel 7-aminoalkyl substituted pyrazolo[1,5-a]pyrimidine derivatives were synthesized and tested for inhibition of cathepsin K. The synthetic methodology comprises cyclization of 5-aminopyrazoles with N-Boc-α-amino acid-derived ynones followed by transformation of the ester and the Boc-amino functions. It allows for easy diversification of the pyrazolo[1,5-a]pyrimidine scaffold at various positions. Molecular docking studies with pyrazolo[1,5-a]pyrimidine derivatives were also performed to elucidate the binding mode in the active site of cathepsin K. The synthesized compounds exhibited moderate inhibition activity (Ki ≥ 77 μM).
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