Trifluoroacetic acid → 4,4'-(1-(4-Fluorophenyl)pyrrolidine-2,5-diyl)bis(2-nitroaniline)

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Reaction Steps

The product from Example 29B (0.78 g, 1.15 mmol) was dissolved in dichloromethane (10 mL) at room temperature and treated with TFA (1.8 mL, 23.0 mmol) for 3 h. The residue was concentrated and partitioned between dichloromethane and sodium bicarbonate solution. The organics were concentrated and purified by chromatography on silica gel with a 40 g column, eluting with dichloromethane to give 0.218 g (43%) of the trans isomer.

Provenance & Evidence