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Estrogenic activity of B-fluorinated o-carborane-1,2-bisphenol synthesized via S(N)Ar reaction
Kiminori Ohta1, Takumi Ogawa, Yasuyuki Endo
1Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan.
Abstract:
We previously identified o-carborane bisphenol BE360 (4) as a selective estrogen receptor modulator (SERM), which ameliorated bone loss without inducing estrogenic action in uterus of OVX and ORX mice. Here, we synthesized a fluorinated derivative, B-fluorinated o-carborane bisphenol BE310 (5) by means of S(N)Ar reaction. Compound 5 was a partial ER agonist, like 4, with little change of ERα and ERβ selectivity as compared with 4. However, its agonistic activity was 40 times weaker than that of 4. Thus, 5 is a novel SERM candidate with potential for reduced estrogenic side effects, and in vivo evaluation as an anti-osteoporosis agent seems warranted.
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