76006-10-5Relevant articles and documents
A pyrazolopyridine compound and method for preparing the same
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, (2016/11/14)
The invention relates to a pyrazolopyridine compound and a preparation method thereof. The compound is 3-bromo-1H-pyrazolo[3,4-c]pyridine-7(6H)-one, and the preparation method comprises the following steps: (1) by taking the compound 1 2-chloro-3-amino-4methylpyridine as a starting raw material, etherifying 2-chloro-3-amino-4methylpyridine through sodium methoxide under the catalysis of copper iodide; (2) closing pyrazole ring through isoamyl nitrite; (3) feeding pyrazol-3 through NBS (N-Bromosuccinimide); (4) removing methoxyl to obtain phenyl (mixture difficult to separate) through pyridine hydrochloride; (5) performing acetyl protection to the obtained mixture so as to separate and purify; and (6) deacetylating through using potassium carbonate as a base to obtain a final product; and according to the preparation method, the mixture difficult to purify in the reaction process is conveniently separated and purified by adopting a method of performing protection and then removing protection, and the purification difficulty caused by instability of an intermediate product can be solved.
A pyrazole compound pyridine and its preparation method
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, (2018/01/19)
The invention relates to a pyrazolo pyridine compound and a preparation method thereof. The pyrazolo pyridine compound is 3-bromine-7-hydroxy-pyrazolo pyridine. The preparation method comprises the following steps: (1) carrying out substitution reaction on 12-chlorine-4-methyl-3-aminopyridine as an initial raw material to form a compound 2; (2) carrying out ring closure on the compound 2 to form a compound 3, namely pyrazolo pyridine; (3) bromizing the compound 3 by adopting N-bromosuccinimide to obtain a compound 4; (4) forming the methoxyl of the compound 4 into a phenolic hydroxyl group by utilizing hydrochloric pyridine to obtain a compound 5a; (5) carrying out acetyl protection on the compound 5a to obtain a compound 6a; and (6) eliminating the acetyl protection on the compound 6 to obtain a final product, namely a compound 7. The obtained final product has a wide application prospect on the aspects of preventing and curing cancer.
Pyrazolopyridines. Part 5. Preparation and Reactions of Pyrazolopyridines
Chapman, David,Hurst, Jim
, p. 2398 - 2404 (2007/10/02)
A series of pyrazolopyridines has been prepared by nitrosation of 3-acetamido-4-methylpyridines and subsequent rearrangement and cyclisation of the N-acetyl-N-nitroso-compounds produced.The reactions of the pyrazolopyridines have been investigated. 1- and 2-Acetyl and 1- and 2-benzyl compounds were obtained and their structures elucidated spectroscopically.The ring system readily undergoes electrophilic substitution in the 3-position. 7-Chloropyrazolopyridine has been shown to be more susceptible to nucleophilic substitution than the isomeric 5-chloro-compound.