Hydrochloric Acid → HCID 69671321, compound

Participants

Reaction Steps

A mixture of 3-(2-methoxy-4-nitrophenyl)-6-(4-methoxyphenyl)-[1,2,4]triazolo[4,3-a]pyridine (50 mg, 0.13 mmol) and SnCl2 (120 mg, 0.65 mmol) in ethyl acetate (25 mL) was heated to reflux for 6 h under Argon. The reaction mixture was cooled to room temperature and basified to pH=10 with saturated aqueous Na2CO3. The biphasic solution was separated and the aqueous layer was extracted with ethyl acetate (40 mL). The combined organic layers were washed with brine and concentrated. The residue was purified by flash column chromatography (petroleum ether:ethyl acetate=2:1 to 0:1) to give crude product as yellow oil. The oil was stirred in a solution of HCl in ethyl acetate (2M, 20 mL) at room temperature, and then was mixed with water (30 mL). The aqueous phase was washed with ethyl acetate (30 mL), basified with saturated aqueous Na2CO3 to pH>10 and extracted with ethyl acetate (30 mL). The organic phase was stirred with a solution of HCl in ethyl acetate (2M, 10 mL) at room temperature for 2 h and concentrated in vacuo to give the title compound as yellow solids (16 mg, 30% yield). 1H NMR (DMSO-d6): 8.32 (s, 1H), 8.19 (dd, J=9.6 and 1.2 Hz, 1H), 8.09 (d, J=9.6 Hz, 1H), 7.72 (d, J=8.7 Hz, 2H), 7.36 (d, J=8.4 Hz, 1H), 7.08 (d, J=8.7 Hz, 2H), 6.61 (d, J=1.5 Hz, 1H), 6.52 (dd, J=8.4 and 1.5 Hz, 1H), 3.82 (s, 3H), 3.79 (s, 3H). MS: m/z 347.1 [M+H+].

Provenance & Evidence