Compounds of Formula I or pharmaceutically acceptable salts thereof.
wherein R
1
, R
2
, R
3
and R
4
are as defined in the specification as well as salts and pharmaceutical compositions including the compounds are prepared. They are useful in therapy, in particular in the management of pain.
Synthesis and Anti‐proliferative Activity of Novel Polysubstitued Indazole Derivatives
A simple and efficient process is developed for the synthesis of new N‐(1‐alkyl‐3‐chloro‐4‐ethoxy‐1H‐indazol‐5‐yl)‐arylsulfonamides 4a–d and N‐(1‐alkyl‐3‐chloro‐1H‐indazol‐5‐yl)‐arylsulfonamides 5a–d through the reduction of 1‐alkyl‐3‐chloro‐5‐nitroindazoles 2a,b with SnCl2 in ethanol followed by coupling the corresponding amine with arylsulfonyl chlorides in pyridine. All the newly synthesized compounds