An efficient synthesis of pyrazolo[3,4-<i>b</i>]pyrrolo[2,3-<i>d</i>]pyridines from 5-aminopyrazoles and cyclic β-keto ester
作者:Raghunath B. Toche、Bhausaheb K. Ghotekar、Dhananjay B. Kendre、Muddassar A. Kazi、Madhukar N. Jachak
DOI:10.1002/jhet.5570450624
日期:2008.11
5-Chloroethylpyrazolo[3,4-b]pyridines were synthesized by condensation of 5-aminopyrazoles with α-acetyl γ-butyrolactone followed by cyclization treating with phosphorous oxychloride. 5-Chloroethyl-pyrazolo[3,4-b]pyridines, thus obtained, were then converted to the corresponded tricyclic pyrazolo[3,4-b]-pyrrolo[2,3-d]pyridines by treating with some primary amines.
通过将5-氨基吡唑与α-乙酰基γ-丁内酯缩合,然后用三氯氧化磷环化,合成5-氯乙基吡唑并[3,4- b ]吡啶。然后通过用一些伯胺处理,将由此获得的5-氯乙基-吡唑并[3,4- b ]吡啶转化为相应的三环吡唑并[3,4- b ]-吡咯并[2,3- d ]吡啶。