Novel and potent calcium-sensing receptor antagonists: discovery of (5R)-N-[1-ethyl-1-(4-ethylphenyl)propyl]-2,7,7-trimethyl-5-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide monotosylate (TAK-075) as an orally active bone anabolic agent.

Abstract:

:The calcium-sensing receptor antagonist (CaSR) has been recognized as a promising target of anabolic agents for treating osteoporosis. In the course of developing a new drug candidate for osteoporosis, we found tetrahydropyrazolopyrimidine derivative 1 to be an orally active CaSR antagonist that stimulated transient PTH secretion in rats. However, compound 1 showed poor physical and chemical stability. In order to work out this compound's chemical stability and further understand its in vivo efficacy, we focused on modifying the 2-position of the tetrahydropyrazolopyrimidine. As a result of chemical modification, we discovered (5R)-N-[1-ethyl-1-(4-ethylphenyl)propyl]-2,7,7-trimethyl-5-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide monotosylate 10m (TAK-075), which showed improved solubility, chemical stability, and in vivo efficacy. Furthermore, we describe that evaluating the active metabolite is important during repeated treatment with short-acting CaSR antagonists.

journal_name

Bioorg Med Chem

authors

Yoshida M,Mori A,Morimoto S,Kotani E,Oka M,Notoya K,Makino H,Ono M,Shirasaki M,Tada N,Fujita H,Ban J,Ikeda Y,Kawamoto T,Goto M,Kimura H,Baba A,Yasuma T

doi

10.1016/j.bmc.2011.02.001

subject

Has Abstract

pub_date

2011-03-15 00:00:00

pages

1881-94

issue

6

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(11)00097-6

journal_volume

19

pub_type

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