反应详情

In step 1 of Scheme A, nitroindazole compound a is treated with iodine or iodine equivalent to form 3-iodo indazole compound b. The amine functionality at the 1-position may be protected (not shown) prior to carrying out this step, and then subsequently deprotected. In step 2 the iodoindazole b is reacted with aryl boronic acid c in the presence of suitable palladium catalyst to afford 3-aryl indazole d. Aryl boronic acid c may in certain embodiments be replaced with a corresponding heteroaryl boronic acid. In step 3 the nitro group on indazole compound d is reduced to yield amino-substituted indazole e. Indazole e in step 4 is then treated with arylsulfonyl chloride f to form the sulfonamide compound g, Compound g is a compound of formula Ia in accordance with the invention.