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).

中文翻译：

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7-（氨基烷基）吡唑并[1,5-a]嘧啶衍生物作为组织蛋白酶K抑制剂的合成及生物学评价。

合成了一系列新颖的7-氨基烷基取代的吡唑并[1,5-a]嘧啶衍生物，并测试了其对组织蛋白酶K的抑制作用。合成方法包括用N-Boc-α-氨基酸衍生的炔酮环化5-氨基吡唑通过酯和Boc-氨基官能团的转化。它使得吡唑并[1，5-a]嘧啶支架易于在各种位置上多样化。还进行了与吡唑并[1,5-a]嘧啶衍生物的分子对接研究，以阐明组织蛋白酶K活性位点的结合模式。合成的化合物表现出中等的抑制活性（Ki≥77μM）。