Hydrochloric Acid → 5-Cyclopropyl-N-methyl-2-(5-methylpyridin-2-yl)-6-[(methylsulfonyl)amino]-2H-indazole-3-carboxamide

Participants

Reaction Steps

To a suspension of (v) (2.75 g, 8.6 mmol) in DCM (30 mL) at 0° C. was added DIPEA (4.40 mL, 25.0 mmol) followed by methanesulfonyl chloride (3.30 mL, 42.0 mmol). The reaction mixture was stirred at RT for 1 h and then washed with aq. sat'd. NaHCO3 (50 mL), brine (50 mL) and dried (MgSO4). Removal of solvent in vacuo gave the crude product, which was then dissolved in EtOH (100 mL) and 1,4-dioxane (20 mL). To the resultant solution was added KOH (˜10 eq) portionwise at RT until the pH 8-9 was achieved. The reaction mixture was then slowly neutralised by addition of 1M HCl (aq) and volatiles removed in vacuo. The residue was taken up in EtOAc (50 mL) and washed with water (50 mL). The organic phase was dried (MgSO4), concentrated in vacuo and the solid residue then triturated with EtOAc. The solid was separated by filtration and dried in a stream of air and purified further by automated column chromatography (Biotage SP4, 12 g Grace Resolve cartridge) eluting with EtOAc:n-heptane (gradient elution from 60% to 100%.v/v) to give Compound (2) (2.42 g, 72%). ESI-MS: calculated [M+H]+ 400.1 observed [M+H]+ 400.1. 1H NMR (400 MHz, CDCl3) δ 8.94 (brd, J=3.9 Hz, 1H), 8.38 (s, 1H), 7.99 (s, 1H), 7.90 (d, J=8.3 Hz, 1H), 7.86-7.77 (m, 2H), 7.17 (s, 1H), 3.18 (s, 3H), 3.09 (d, J=4.7 Hz, 3H), 2.50 (s, 3H), 1.84-1.76 (m, 1H), 1.15-1.04 (m, 2H), 0.84-0.74 (m, 2H).

Provenance & Evidence