Trifluoroacetic acid → 1-(4-Chloro-phenyl)-6-(4-iodo-phenyl)-7-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c)pyridine-3-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A solution of 1-(4-chloro-phenyl)-6-(4-iodo-phenyl)-7a-morpholin-4-yl-7-oxo-3a,4,5,6,7,7a-hexahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylic acid methyl ester (52, 595 mg, 1.0 mmol) in methylene chloride (CH2Cl2, 4 mL) was treated with trifluoroacetic acid (TFA, 1.0 mL) at 25° C., and the resulting reaction mixture was stirred at 25° C. for an additional 30 min. When HPLC and TLC showed the reaction was complete, the solvents were removed in vacuo. The residue was directly purified by flash column chromatography (SiO2, 5–20% EtOAc/hexane gradient elution) to afford the desired elimination product (53, 467 mg, 508 mg theoretical, 92%) as a pale-yellow oil, which solidified upon standing at room temperature in vacuo. For 53, CIMS m/z 508/510 (M++H, C20H15ClIN3O3).

Provenance & Evidence