Practical Synthesis of 1H-Indazole-3-carboxylic Acid and Its Derivatives
摘要:
A practical and convenient synthesis of 1H-indazole-3-carboxylic acid and its amide and ester derivatives from the corresponding derivatives of 2-nitrophenylacetic acid was described.
A straightforward and effective procedure for the preparation of 1H-indazole-3-carboxylic acid esters and amides was developed. A series of functionalized 3-iodoindazoles were subjected to Pd-catalyzed carbonylations in the presence of methanol or amines, yielding the title compounds in moderate to good yield. For the majority of examples, the reaction proceeded cleanly under mild conditions, which
Compounds of formula (I) or a stereoisomer or pharmaceutically-acceptable salt thereof, are useful in the modulation of IL-12, IL-23 and/or IFNα, by acting on Tyk-2 to cause signal transduction inhibition.
A practical and convenient synthesis of 1H-indazole-3-carboxylic acid and its amide and ester derivatives from the corresponding derivatives of 2-nitrophenylacetic acid was described.