Cyclopropanesulfonyl chloride → 1-[6-Chloro-5-cyclopropanesulfonylamino-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 1-[5-amino-6-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester (Intermediate from Example 41, product from Step A) (0.100 g, 0.254 mmol) in pyridine (1.5 mL) was added dropwise cyclopropanesulfonyl chloride (71.0 mg, 0.510 mmol) at 0° C. The reaction mixture was slowly warmed to 23° C., and maintained at this temperature for 42 h. The reaction was quenched with sat. aq. sodium bicarbonate (10 mL) and extracted with EtOAc (3×15 mL). The combined organic layers were washed with brine (10 mL), dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) (10-55% EtOAc/hexanes) to yield the titled compound (96.0 mg, 76%), which was recovered as a 5:4 mixture of regioisomers. MS (ESI/CI): mass calcd. for C20H24ClN5O6S, 497.1; m/z found, 498.1 [M+H]+. 1H NMR (400 MHz, CDCl3): 8.83 (s, 1H), 8.19 (s, 1H), 8.03 (s, 1H), 7.71 (s, 1H), 6.73 (s, 1H), 6.14 (s, 2H), 4.31-4.28 (m, 2H), 3.71-3.64 (m, 2H), 3.51-3.45 (m, 2H), 3.32 (s, 3H), 2.54-2.44 (m, 1H), 1.43-1.35 (m, 3H), 1.21-1.11 (m, 2H), 1.00-0.92 (m, 2H).

Provenance & Evidence