Sodium Thiosulfate → HCID 66937196, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-[6-chloro-5-(4-chloro-phenylsulfanyl)-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester (Intermediate from Example 61) (2.69 g, 5.16 mmol) and dichloromethane (26 mL) was added mCPBA (2.43 g, 10.8 mmol) at 23° C. The reaction was stirred for 16 h at 23° C. Dichloromethane (30 mL) was added followed by a solution of sodium thiosulfate (1.71 g, 10.8 mmol) in 80% saturated aqueous NaHCO3 (30 mL). The mixture was stirred vigorously until both layers were clear. The organic layer was collected and the aqueous layer extracted with CH2Cl2 (2×80 mL). The organic layers were combined, dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) (0-100% EtOAc/hexanes) to yield the titled compound (2.55 g, 89%) as a mixture of regioisomers. MS (ESI/CI): mass calcd. for C23H22Cl2N4O6S, 552.1; m/z found, 553.1 [M+H]+. 1H NMR (400 MHz, CDCl3): 8.91-8.89 (m, 2H), 8.73 (s, 1.4H), 8.68 (s, 0.6H), 8.20 (d, J=0.6 Hz, 0.6H), 8.18 (d, J=0.6 Hz, 1.4H), 7.91-7.87 (m, 4H), 7.72 (s, 0.6H), 7.68 (s, 1.4H), 7.48-7.43 (m, 4H), 6.27 (s, 1.2H), 6.15 (s, 2.8H), 4.39-4.32 (m, 4H), 3.71-3.66 (m, 1.2H), 3.67-3.62 (m, 2.8H), 3.48-3.45 (m, 1.2H), 3.44-3.40 (m, 2.8H), 3.28 (s, 1.8H), 3.24 (s, 4.2H), 1.40-1.34 (m, 6H).

Provenance & Evidence