- Preparation method of 2,3'-dimethoxy-[2,4']bipyridine
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The invention discloses a preparation method of 2,3'-dimethoxy-[2,4']bipyridine. The preparation method comprises the following steps: performing a reaction on 3-methoxypyridine and a reagent A underthe alkaline conditions at -100 to 80 DEG C so as to obtain 3-methoxy-4-R-pyridine, and performing a reaction on 3-methoxy-4-R-pyridine and 2-bromo-3-methoxypyridine under the alkaline conditions under the catalysis action of a catalyst at -20 to 180 DEG C so as to prepare 2,3'-dimethoxy-[2,4']bipyridine. The preparation method of 2,3'-dimethoxy-[2,4']bipyridine has the advantages of a high yieldand cheap and easily available raw materials, and is suitable for large-scale production.
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Paragraph 0027
(2019/08/20)
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- PHOSPHODIESTERASE 4 INHIBITORS
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PDE4 inhibition is achieved by novel compounds of the Formula (I) wherein R1 and R2 are as defined herein.
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