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米诺膦酸的合成_王伟
Chinese Journal of Pharmaceuticals 2012, 43 5 321
*
200437
2- 4- 2- 1,2-a -3-
/ 23
2-
R979.9 A 1001-8255 2012 05-0321-03
Synthesis of Minodronic Acid
WANG Wei, JIN Hua, WANG Jiajing, ZHOU Bin*
State Key Lab. of New Drug and Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry,
China State Institute of Pharmaceutical Industry, Shanghai 200437
ABSTRACT: Ethyl 2- imidazo 1,2-a pyridin-3-yl acetate 5 was synthesized by cyclization of 2-aminopyridine
and ethyl 4-bromo-3-oxobutanoate in the presence of NaHCO in hot dioxane, and subsequently hydrolysis with
3
concentrated HCl to yield 2- imidazo 1,2-a pyridin-3-yl acetic acid hydrochloride 6 . Compound 6 was treated with
phosphorous acid and phosphorus oxychloride, followed by hydrolysis with HCl and then recrystallization from H O to
2
afford the highly purifi ed anti-osteoporosis agent minodronic acid 1 in 23 overall yield based on 2-aminopyridine .
Key Words: minodronic acid; anti-osteoporosis agent; synthesis
minodronic acid 1 1-
-2- 1,2-a -3- 1
4
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